Well, you know a lot of tube trains have open/close doors buttons which don't work. Isn't it always amusing judging the morons who press them when the train pulls into the station? (Though to be fair, I've stood longer than I've needed to in front of a DLR door waiting for it to open automatically.)

I've noticed people struggling with the new Overground trains' windows, but haven't wished to try them myself for fear of looking like an idiot.