What do you think were some of the meanest things Endora did to Darrin?

The 'three wishes' time and the one when he was supposed to be the least likable person around were both pretty bad.

When she shrunk him down to size. At the end of the spell he was like a foot tall and almost got chased & ravaged by a dog & mistaken for a leprachaun.

The ears episode also wasn't very pretty for Darrin.