Twitter is taking the piss out of US swimmer Michael Phelps for his very serious #PhelpsFace

With 23 medals he may be the most decorated Olympian of all time, but after looking a bit stern at Rio, Twitter was on hand with some piss-takery and rampant speculation about why Michael Phelps looked so moody. Here are some highlights…

Feel the dark side #PhelpsFace pic.twitter.com/xiz8Ey5nog

— tropornot (@blumgold2) August 9, 2016

Michael Phelps. #Olympics pic.twitter.com/mewOF4N0CI

— nascarcasm (@nascarcasm) August 9, 2016

When you wake up before the alarm #PhelpsFace pic.twitter.com/W5F35vULKt

— Jessica Reyes (@jessicareyes) August 9, 2016

When you're about to swim against someone dressed like a Teenage Mutant Ninja Turtle #PhelpsFace pic.twitter.com/kUdjpEyVWA

— Todd 🐪 (@Rev_Todd) August 9, 2016

Like father, like son. #PhelpsFace pic.twitter.com/optbLOAgiH

— TODAY (@TODAYshow) August 9, 2016

When Kanye interrupts your medal ceremony. #PhelpsFace pic.twitter.com/8i6bZDpIS2

— Mike Schaffer 🏠 (@mikeschaffer) August 9, 2016

"Your password must contain uppercase and lowercase letters, numbers, and symbols" #PhelpsFace pic.twitter.com/QgP088q6uk

— Nick Jones (@Neezy529) August 9, 2016

Maybe the #PhelpsFace is just Assassin's Creed cosplay? pic.twitter.com/TF8XKlT3QQ

— The Volatile Mermaid (@OhNoSheTwitnt) August 9, 2016

https://twitter.com/bobbywfrancis/status/762853040235876352

https://twitter.com/ldwin/status/762851986756608001

https://twitter.com/rissyk12/status/762851908146999296

#PhelpsFace in prisma looks like a Disney villain. pic.twitter.com/lrr3SkcSTw

— Jon Perri (@_jonperri) August 9, 2016