Grandpa and Little Johnny are sitting on a bench in the park. Johnny asked, "Grandpa are you going to take that new Viagra?"

Grandpa, caught off-guard, looks at him and says, "No Johnny, I will not."

"But Grandpa, why not?" asks little Johnny.

Grandpa replies, "Well Johnny, because there is no sense in putting lead in your pencil if you have no one to write to."