Competition shows foster plenty of rivalries, but few are as entertaining and light-hearted as the friendly squabbles between Adam Levine and Blake Shelton on NBC’s The Voice. So when the Maroon 5 frontman recently shaved his head, Shelton took shots on Twitter, comparing him to Voldemort, Squidward and even a sperm cell. But the country singer forgot  about one important thing: He who did not butcher "Hotline Bling" and ruin it for everyone else should cast the first stone. 

In a short clip uploaded by Late Night with Seth Meyers, the country singer said he downloaded an app called “Pic Stitch or something” to create the memes. He also explained how he searched the term “sperm” on Google and carefully selected the perfect picture for the final product.  If you’re into old man humor, check out the tweets below. 

Hello everybody!! Just checking in to make sure @adamlevine still looks like Casper... Yep! pic.twitter.com/HlfYH0W9Hx

— Blake Shelton (@blakeshelton) October 25, 2015

Hey everybody!! Just checking in to make sure @adamlevine still looks like Squidward.. Yep!!! pic.twitter.com/ZYT7iigt5x

— Blake Shelton (@blakeshelton) October 25, 2015

Hey everybody!!! Just checking in to make sure @adamlevine still looks like a sperm cell... Yep! pic.twitter.com/uyaYmQF6of

— Blake Shelton (@blakeshelton) October 25, 2015

Hey yall!!! I just wanted to check in and make sure @adamlevine still looks like Lord Voldemort... Yep! pic.twitter.com/f9SUqzPtp2

— Blake Shelton (@blakeshelton) October 26, 2015

However, Levine did clap back (if you can even call it that).

Excuse me. Lex Luthor was bald. I have "shaved" my head. Meaning, shaved by choice. Big difference. Ok?!! Ok?!!

— Adam Levine (@adamlevine) October 13, 2015