You help one neighbour with their car and it snowballs.

Oh yeah. People at church are constantly asking me car questions, a little less often for actual repairs though. I'm happy to help when I can, but I make it clear that I'm not a mechanic, I only do it as a hobby.
Yeah I hear ya. Just yesterday while working on my car a lady neighbour called my friend away. He spent a bout 15 minutes looking at her little problems. I just walked away and took a break *sigh*. He has a hard time saying no and I warn him about taking on too much but he's just a nice guy.