I went for a $17 haircut yesterday and was planning on tipping to $20 (it seemed like a nice round number) until I noticed that the customer before me didn't tip at all, even though he remarked on how pleased he was with his cut. I changed my mind and decided tipping to $19 would be more appropriate.
Likewise, I frequently visit one of the Tim Horton's on campus for their Iced Cappucinnos. They require a straw, which at Tim's is always wrapped in paper. So it's not uncommon to see a bunch of crumpled-up straw coverings on their counter (and sometimes an assortment of other garbage -- I saw a Kit Kat wrapper there the other day). When there are straw wrappers already on the counter, I usually leave mine behind as well. But when the counter is clean, I usually feel guilty about being the first to litter and tuck the wrapper in my pocket to dispose of later.
