So Kevin Manion from Wisconsin decided to swap a single family photo to a picture of Steve Buscemi every day to see how long it would take for his parents to notice.
My brother has been replacing family photos with pics of Steve Buscemi and my mom hasn't noticed
His sister Clare, whose tweet about the prank has now gone viral, told BuzzFeed News her brother came up with the idea while they were bored during their summer holidays.
She said: "My dad noticed [on] the second day but my mom didn't notice until the fifth day."
Manion added: "She was in the kitchen and could tell something was wrong with my brother's senior photo, like the colors were wrong, and his head was too big, so she walked over to it and started laughing so hard."
The internet has now declared Kevin Manion a genius.
So I guess the Internet thinks I'm pretty funny
And a hero, because he clearly is. 🙌
@claremaura your brother is my hero