I hate going out to eat with foreign folk who grab the check, as they often seem to tip poorly. I mean, not necessarily foreign, but people in general who tip for #$%#. Which is often foreign people. But not always. I worked in food service once, yo. I know how sucky it is to get shafted on tips, so I try to always tip well, unless service was particularly poor.

But when I'm out with someone else, and they grab the check, and they're doing the tipping, but they're hardly even tipping 10%...

I dunno. I could confront them. Which I do sometimes. I could covertly leave some extra tip on the table, which I have also done. It's not the end of the world or anything. I just hate being in that position in the first place.