You know... When I first read the subject of this thread, I thought it was another joke.... (Like, "Why do they always make Gojet jumpseaters sit by the lav?" "'Cause they try to keep all the ****** in one place")...

On-topic, the trash bag in the ERJ hangs from the jumpseat as well.. It's on the FO's side, but only 'cause that's where the seat folds to...