That story is just way too funny man
To all the others: thanks for your replies...
Sometimes, I see pictures of aircraft whose contrails only seem to develop like 100 meters behind the engine. On other pictures, such as the one posted on top of this thread, the contrails already show up only a few meters behind the engine.
Thanks for the picture. Very interesting. I'll put it once more underneath (resized):
To all of you that are going to fly within the next few days or so: if you have a digital camera, try to make a picture of the contrails from the inside of the aircraft, and send it to me or so...I'll put them on my webspace, so I can post them...