Number Two: Ask him a question and don't let him answer

"Hey, Dib. where's the mash potatoes?" asks a classmate.

Dib responds. "Oh they're over--"

"WHERE'S THE MASH POTATOES?!"

"Over th--"

"WHERE?"

"Ov-"

"HUH?"

"O-"

"WHAT?"

"OVER---"

"Ne'ermind i found it."