as others noted, all kinds of handicaps but if unless they're hogging up the last spot, I wouldn't care with presumption something afflicting em. Otherwise catch a lift and subversively or directly inquire.
As far as handicaps though, always liked this joke, sorry for hijack:
A priest, a doctor, and an engineer were waiting one morning for a slow group of golfers.
Engineer: What's up with these guys? We have been waiting for 15 minutes!
Doctor: I don't know.
Priest: Hey, here comes the greens keeper. Let's have a word with him.
Priest: Hi George. Say, what's with that group ahead of us? They're rather slow today, aren't they?
Greens Keeper: Oh yes, that's a group of blind firefighters. They lost their sight while saving our clubhouse last year, so we let them play here anytime free of charge.
Priest: That's so sad, I think I will say a special prayer for them tonight.
Doctor: Good idea. I'm going to contact my ophthalmologist buddy and see if there is anything we can do for them.
Engineer: Why can't these guys play at night?