When people mishear you and call him Justin Beaver.
Which becomes funnier if you know German, because his surname translates to exactly that.
The Bieber or Die self-deprecation.
Justin: Sometimes I don't feel like walking, so I make enormous people carry me around.
Justin: I tried to go into a nightclub once, but the security guards were like "Excuse me, sir, you're not old enough." So I bought the club and I turned it into a Chuck E. Cheese. Now who's old enough, bitch?