Just after these things started I hired one to ride home from the pub. Not reading the prices properly I thought it was £2 for 24 hours. Which—I'm sure you'll agree—is quite an easy mistake to make. I decided just to ride home and drop the bike off in the morning, it was still within 24 hours so it shouldn't be a problem.
Turns out I got charged £52 for having it over 6 hours. Was only a tenner in a taxi :(
That was well worth the giggle. TFL you suck!