It takes two. One to change the bulb, and the other to kick the switch.
or
His powder puff is on the wrong end.
or
They turn from notating nuclear spins to notating unclear puns.
or
he said "Not you again".
or
Climb up a tree and act like a nut
or
Six. One to turn the bulb, one for support, and four to relate to the experience.
or