"God is a comedian in front of an audience too scared to laugh."
So go ahead, laugh, and don't worry about whether or not anyone knows.
(That reminds me -- I still haven't seen The Dark Knight yet.)
(On the other hand, I'm still not sure if seeing it in the Medicine Hat multiplex won't ruin the entire experience.)
(For comparison, I saw Batman Begins at the Grande Prairie Cinema 6 without a worry.)
(Apparently, I'm applying to be the Headmaster of House Parentheses. I should stop now.)