In case you don't know, a brony is a male fan of the show My Little Pony: Friendship is magic. The reason for this speculation is that the former president answered 3 questions about My Little Ponies correctly.
President Bill Clinton was on a radio station called “Wait, Wait… Don’t Tell Me.” He was there for both the serious reasons of discussing his Clinton Global Initiative, and also to answer the whimsical questions of an easily amused radio show host. Clinton apparently knows all about My Little Ponies.
In that particular section of the show, President Clinton was asked questions about My Little Pony, and if he got two out of three questions right he would win a prize for a listener. The lucky listener when Clinton was playing the game was Dave Parks.
The first question he answered right was the “particular enthusiasm” of the My Little Pony Rarity. He answered correctly: answer B: giving other ponies makeovers. The second question he got correctly was what the ponies got when they found their true talent. My Little Ponies get a tattoo on their flank called a cutie mark.
Finally, Clinton knew that the Ponies enemy was the evil pony Nightmare moon. Clinton, in addition to reading up on his My Little Ponies (or getting lucky guessing, you choose) has been busy with his Global Initiative. His program has helped over 300 million people. He is also trying to help develop programs to create more jobs.