Always loved these. Two memories:
1) We had a meet every year that included a fat man relay. The only "eligibility" criterion was that each guy on the relay had to have been in a throwing event in the meet.
So one year we're light on throwers who can do *any* running, and I need a fourth. I grab my 6ft/142lb quartermiler and tell him he's gonna be a javelin thrower. Turns out that this has been the kid's secret dream. (Everybody on a track team seems to think that s/he can throw jav--why is that?) He gets a strong dose of reality in the javelin competition but anchors the relay to a win, against a kid (literally twice his size--or at least weight) from another school who'd been ragging on him.
2) One year (1970s) a bunch of American distance runners and throwers were on a European tour and talking smack to each other about sprint speed. So at one of the meets a special 4 x100 between the two groups was added.
The result was about what you'd expect, although the distance runners *did* complete the third pass before the throwers hit the tape.
Not much before, though.