Because they won't hold a public erection.
A: Siamese twins.
By holding the bulb up to the socket and waiting for the world to revolve around them EDIT: Rip inbox EDIT 2: Thanks for the gold!
we have the Iron Giant
The singer can have a hit
A: When he got the momentum, he couldn't find the position, and when he found the position, he couldn't muster up the momentum.
They're shellfish in bed.
Because Kim Jung Un doesn't want a public erection