Another Joke by JD

Apparently I have the honor of "best reaction to this joke ever." I love being a superlative.

JD: You want to hear a dirty joke?
Me: Not really but O.K.
JD: So this white horse jumps into a mud puddle.
Me: Ooo a horse! I like this one!
ttttThen what happens?
JD: That's it. That's the joke.
Me: OOHHH. The white horse gets dirty! I get it! That's awesome!