[Pelham]

“You can’t build a real fence over that vast distance. It would take 15 years and billions of dollars.”

I’ll put you down in the Just Give Up category.

The Just Give Ups told Kennedy his Moon shot wasn’t possible. Instead of listening to them he filled NASA with Can Do engineers willing to take on the challenge.

[Rutles4Ever]

“You can’t build a real fence over that vast distance. It would take 15 years and billions of dollars.”

I’ll put you down in the Just Give Up category.

Well why stop there? Let's add a continuously burning moat of fire patrolled by angry gorillas in Kevlar.