a boiled bullfrog - A bullfrog that’s been cooked and still doesn’t know it’s de

A bullfrog that’s been cooked and still doesn’t know it’s dead.

My dad still thinks he’s the cool one even though he’s been retired for 5 years.

That guy still thinks he’s the best at video games even though he lost to a 10-year-old.

My teacher still thinks I’m the smartest kid even though I flunked math.