I was going to put a picture with my original answer, then figured it would probably just get removed.
So...I'll change my answer to.... Don't talk.
"Catch ya later ..... gotta run!" (And then literally run!)
If it's an awkward conversation then I usually 1 up the person and make it to the point where they leave
toss your cookies
Just say....gotta run, catch you later!
Feign death until it just gets awkward and they go away.