Two. One to get up on his high horse and another to chastise the first about oppressing horses.
To change sides.
I don't know, I left early.
Why does it have to be a group activity
I don't know but that reminds me of a similar joke my uncle used to tell...
They chia'd.
GRRAAAAINS!!
Get off your high horse.
Stop-oppressing-me
None. Once they shut up, no-one has any reason left to oppress them :)