My brother is 12...

Really he's like 32 or something but you wouldn't know it.

We're on the subway. I'm having a conversation with his wife and her cousin. My brother is standing next to where we are sitting. My sister-in-law says something to my brother but he's not listening. He starts laughing to himself. We ask him what's so funny. He says look, and then proceeds to cover up some lines on the subway's emergency alert box so that it no longer reads: In an emergency, to alert crew members, open box and press strip and instead reads: In an emergency, to alert crew members, strip.

My brother is 12.