P-hub fallacy
You're so full of yourself that you think you're the only one who does dumb stuff, but you're just as dumb as the person you're talking to.
"You're wearing that ugly shirt to school?" I said. Then I remembered I was wearing the same one.
"You're eating that greasy pizza in the library?" I said. Then I realized I had a slice in my hand.
"You're talking to that girl in the lunchroom?" I said. Then I remembered I was talking to her too."