For my Spanish class we have to do a group project, holding a five-minute conversation with another classmate. Asking people to do the project with me feels like I'm asking someone to a school dance:
"Uhm, hey I was wondering, if, uhm, you have a partner yet for, uhm..."
I've been shot down twice, with one of the girls making it actually feel like I was asking for something more: "Oh, dear. I'm so sorry. I've already got someone. I'm really sorry -- I'm sure you'll find someone, though."