I better not tell you, it might spread.
or
1,000,001: One to change the bulb and 1,000,000 to rebuild civilization to the point where they need light bulbs again.
or
What's the use, they'd still have bear feet
or
"Ten billion dollars and high cholesterol!"
or
I said, "I've been on telly but I'm no Dean Martin".
or
It's not a shrub, it's a lemon tree my dear Watson.
or