He was gelded.
Because he's a horse racist.
Bach in the saddle again.
Church " "K let's make 'em like that" -- funeral home designers
It was feeling crumby.
Neckbeard
Ten. (Shame this one doesn't work too well for reddit - the funniest part of this joke is the third punchline enjoying people struggle to understand what the hell you're talking about.)
Because every time they go to the starting gate they're reminded "They're Off!".