Two. One to screw it in, and one to stab the other in the back and take all the credit.
or
When it came time to pay, the skunk didn't have a scent, the deer didn't have a buck so they put the meal on the duck's bill.
or
Five: one to handle the bulb and four to contemplate how David Sanborn would've done it.
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Shamboo!
Frankenstein: Witch can you make me a lemonade?
Witch: Poof you are a lemonade!
or