All right, travelers, 'fess up! Which of these travel sins have you committed?
Yikes, looks like we're all a bunch of tightwads. I too have failed to tip, usually because I didn't have the proper coins/notes. (It happened on a recent trip and I felt terrible -- I paid at a restaurant at a cash register with my credit card, expecting that there'd be a spot for me to add a tip, but there wasn't. All I had in my wallet was a few coins that probably only added up to 5%. I felt awful.)