They don't want you when you're damaged

One of the frustrating things when we were traveling in SEA was using US currency. Some places prefer it, but all the places require that it was in mint condition. I ended up taking a photo of a 10 $ bill that was refused by over a dozen people in 4 countries because it was missing a small piece. I'm not sure why they wouldn't take it because in north america it wouldn't be a problem using it. Mostly it was a pain because people wouldn't want to give change for a 20, and they wouldn't accept a 10 like that, so you get a bit stuck.