Okay, this is kind of off-topic, but I suppose now the time has come for me to finally fess up to this, so here is the story...
When my parents came to help move me and my 2 cats to Munich a year ago at Christmastime, they enjoyed their very first Glühweins here at the many Christmas markets we visited here during their visit. They told me several times how much they liked it, and what fun memories it brought back. So I thought it would be fun to send them some Glühwein in the box with their Christmas gifts. I found some TetraPaks of Glühwein at the grocery store, which I thought would be fine, since I was just doing this more for the fun/nice memories reason, than for the culinary aspect of it. So I packed everything up, and mailed off the package (yes, it was late).
Fast forward a few weeks later... I come home from the gym on a Sunday afternoon... my husband tells me I am now his biggest hero ever (oh-so-very-sarcastically). While I was at the gym, he got a phone call from my Dad in California (about 5 am his time), asking if we knew what the "dark red liquid" leaking from one of the packages might be? Turns out, something happened to the package (no idea what, or how), and it started leaking Glühwein, and due to the leaking package, I was now responsible for shutting down the entire operation of the San Francisco post office for several hours, in the middle of the Christmas rush!!! I was absolutely, utterly mortified and embarrassed, but let me just tell you what a good laugh my husband and entire family got out of this!!!

(It's taken a while, but I can finally laugh about this now)
Moral of the story: Do NOT ship TetraPaks of ANYTHING! (yes, I know I probably should have thought this was a bad idea from the start, but when you're in the middle of the Christmas rush, these logical thoughts just somehow slip one's mind... Although I'd like to think it is perhaps the fault of this faulty ITX chemical Saz mentioned, and not my utter stupidity that caused this disaster!