Because they always miss the joke
The were only two donors. One came on the bus, the other missed the tube.
Because he didn't fancy the stake.
Three. When you tell it to her, then when you explain it to her, and then when she gets it.
Laughing stock.
Your mom can't take a joke.
WRONG! They don't make it, they steal it...
Because he couldn't find the Droid he was looking for.
Because they'd miss each other.