To be strangely attracted to bands that you know are sucky/crappy, and you can't explain why. Usually hidden from friends, and very awkward when someone finds out.
Random Guy 2: Forgive me, I have a severe case of SBA
Random Guy 3: Oh I'm so sorry, I didn't know.
The moment when every guy in the surrounding area cringes and grabs his own balls after a horrific story involving the destruction of ones "manhood".
Also see Penis sympathy