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What's the pettiest thing you've done recently?
I cycle to work, and then get a shower and change in the changing rooms we have on-site. This morning, there was only one other guy in the changing rooms, and he actually pushed my stuff up the bench (while I was standing there) so he could have his towel at the end - despite the whole of the rest of the bench being clear, and there being hooks both inside and outside the cubicles for you to hang your towels up on.
So, I carefully draped my cycle-sweaty socks over his towel, ready for his return from a cleansing shower.