Condescending signs at the workplace

To me being inconsiderate is a form of disrespect. If you respected someone you would also be considerate. If you're not, you obviously don't care much about how they feel. And in public places this happens constantly, people not flushing or cleaning the toilet with the toilet brush, leaving pee on the seat, in office kitchens people leaving their mugs in the sink, and people leaving cigarette stubs all over the place.
I have one roommate here who always leaves crap all over the place, does not wash the dishes she used, does not do the cleaning that was assigned to her (okay, she did, a week and a half later after we asked her three times or so), no, we did not write any sarcastic notes to her, but we did have to ask her three times. And we live together, you would think people would be more considerate if they actually share living space, not just working space. Well, not her... now is this just carelessness? I don't think so.
I always found signs like this funny more than condescending, but maybe that's because they don't tend to address me.

Dude, I am a Molecular Biotechnologist. I don't think the city of Munich would be very happy if I had a lab in my basement and I am sure that I am most certainly on some terrorist watch list.

This is also hanging up at work.

The door to the cellar compartments in my old building had a strong closing spring on it, and if your hands were full of stuff you were fetching from or taking to your compartment, it would swing shut itself quite loudly.

Clearly this bothered someone, but did they get the Hausmeister to fix the spring? Did they write a polite note asking people to close the door quietly?

Of course not, they set out to prove that German's can do sarcasm:

Auch diese Tür kann man leise schliessen (you can shut this door quietly too/even this door can be shut quietly).

And that's what bothers me about a lot of these notes, the writers don't think about how people who read it will react. I shouldn't think it stopped a single person letting the door swing shut. People who are careless will generally remain so.

Notwithstanding, I'm sure a simple "Diese Tür bitte leise schliessen" would have been better, and of course fixing the problem at source would have been better still.

Edit: BTW, I should add this sign wasn't aimed at me, as I hadn't been to the cellar for months, so I guess someone got fed up of most people doing it - which is weird as being on level U2 it was two floors below the nearest flat.

You still have a foot to stop the door from swinging shut though, don't you?

I have two, but I usually stand on them whilst I am carrying unwieldy things that I don't want to drop.

Then how do you move or walk if you need to stand on both of them at the same time? Get multitasking, Guy!

Walking requires both feet on the ground, and I thought multitasking was a woman thing?

Mariposa (nice name, btw! Are you from Spain?): as I said, people who disregard other people's friendly "hints" deserve a good ol' smacking, no doubt.
So I'm certainly not arguing in favour of being a plastic-smile suck-up to rude twats. Just not behaving like a rude twat oneself is best when dealing with said people. One can be firm and even angry without being insulting etc.

Guy, yes I think it is, but you could work on proving the stereotype wrong. And walking requires you to lift one foot at a time, just as stopping a door from slamming shut would.

sue, I am German but living in Spain right now.
And you don't have to tell me about that, I know... I am still nice and say hello to our concierge who woke me up this morning by ringing the doorbell for about 10 minutes just to tell me we needed to open the shutters outside our windows (because they were doing work on our balcony), and she did not even say sorry for waking me. But I'm still trying to be nice to her. Ungh!
But anyway, the people who wrote the signs may just be thoroughly annoyed so they may not be capable of being nice anymore, or they think these signs are more entertaining than the boring "please clean up after yourself" ones... who knows. I always thought of them more as entertaining than rude or condescending anyway.

I'm sure she's interpreting this as you being a weakling. Some people, especially anal retentive power-relationship types that couldn't be nice to to Mother Teresa seem to think that if a person isn't aggressive with you, he must be in a weak position. So take advantage. I'm guessing if you mouth her really angrily and aggressively once or twice, she'll be more careful with you.

Or she will disappear my mail!

Nah, it's just not worth the energy... my best friend told me they used to call women like that mal folladas when she was living in Madrid.

It really does depend on what you're carrying. But enough of this, I'm gonna watch the footy, pointless match that it is.

Would you like to expand. I'm Irish and the "boys" haven't mentioned anything about you to me. What is a "dude" actually?

This one's really condescending. Probably someone who learned the art of sign making in Germany