My Little Pony: Friendship is Magic - Image #230,760

I'm telling ya, no five year old girl is going to get a reference to Mad Men, I guarantee that.
This was made for us bronies, I say.

I can't find a poster that looks like this but it's likely based off the opening credit sequence.
MAD MEN INTRO (video disabled embedding, sorry)

btw, wouldn't a better pun be 'Mad Mares?' I guess they needed to get 'pony' in somewhere though.