Grandpa: I can't find the send button on my cell phone.
Granddaughter: I see the problem grandpa, you're using a calculator.

Grandpa: It's always a calculated risk doing things without my reading glasses.
Granddaughter: No wonder things didn't add up.
Grandpa: Very "Punny" young lady, you're as bad as I am!

Granddaughter: And exactly how did you arrive at that equation?
Grandpa: Time for my nap, I rest my case!