Today was the first time I've wanted to actually do it in class, though.
Before class had even started I began to suspect that the rabble might be in; there was a bunch of people who were nattering away really loudly, which you're not really supposed to do in the studio and it seriously put me off my nap time a bit. In the end a young lady got up and asked them to keep it down a bit. Props to her.
But then when class started…
Basically I had a mannish-looking woman on my left who thought it was OK to dump her towel on my mat when she didn't need it, and a guy on my right who thought it was OK to put his water bottle on my towel when he'd taken a drink. It wasn't, and I let him know as such by relaxing fully backwards in fixed firm pose - which I can't usually do, but somehow gained the ability today, possibly because I was so incensed - and knocking his water over.
Good times, I think you'll agree.
He did actually apologise, but then at the end of class while relaxing in savasana I felt something against my leg. Turns out he'd decided to spread himself out a bit and encroach on my Batman towel. Outrageous. In disgust I got up and pulled it out from under him. I hope he got carpet burns on his hands as a result - it's not what you'd call a fluffy towel, and cheap, sweaty, fast-moving towelling can be particularly unforgiving on soft skin.