The building where I work has absolutely the worst paper dispensers. They're really total failures in design.
The dispensers are too skinny depth-wise, so the next sheet doesn't pull out all the way after you pull out the first sheet, leaving you to have to reach into the tiny slot and try to grab the stack. To confound the dilemma even further, there is no counterweight on top of the papers pushing down, so when you reach in to grab the paper, all you effectively do is push the stack up, failing to actually grab any paper.
This has caused me many a grief, having to come out of the bathroom with semi-wet hands. Why do people not think about things like this? Design and usability should come hand in hand, it's only common sense.