vendors (or even just people in general) tell you they're going to do something right way and then don't, causing me to look like a crazy OCD person when I have to hunt them down later (like 4 days later!) to see what happened. I get that some venders are just really busy, especially during summer wedding season-but then don't tell me you'll do it today, when you really don't have time until next week.
I also hate it when people interchange the use of the words "borrow/borrowed" and "lend/lent" (espcially when they are an English as a Second Language or ESL teacher).
Ok, your turn....GO!