Related:

• An erection is like the Theory of Relativity - the more you think about it, the harder it gets.
• David: "He killed everybody we left behind!" Carol
  Oh of course he didn't. David, you're just making this harder....
• It's getting harder and harder to act weird. -- Zippy the Pinhead
• I think Smithers picked _me_ because of my motivational skills.
  Everyone always says they have to work a lot harder when I'm around....
• Bart: Milhouse, do you ever think about the people in those cars?
  Milhouse: I try not to. It makes it harder to spit on 'em....
• Homer: [plays some chords, then sings tentatively] There was nothing in Al Capone's vault, But it wasn't Geraldo's fault.
  .. [spoken] D'oh!...
• Carpenters hammer it harder.
• Carpenters nail harder.
• I bite harder ...