Watch Justin Bieber Painfully Shotgun A Beer Before Mayweather Fight In Vegas!

Chug, chug, chug!

Justin Bieber may be known for some of his bad boy antics in the past, but apparently he never learned to chug a beer!

The Where Are Ü Now singer was in Las Vegas to watch his buddy Floyd Mayweather Jr.'s fight and decided to shotgun a beer with his friend Sam Shahidi at a pool party.

[ Related: Watch Justin Bieber Become IRATE With The TODAY Show Director Over His Camera Placement ]

Fortunately for us, the 21-year-old singer posted the video to Instagram, unfortunately for JB, he needs a little practice on his chugging skillz!

But the What Do You Mean singer did his best to come up with an excuse by captioning the video:

"I lost but I didn't go to college"

Ch-ch-check out the video for yourself (below) and let us know if you think Justin should be quicker, regardless of not going to college!

I lost but I didn't go to college @sammyA video posted by Justin Bieber (@justinbieber) on Sep 12, 2015 at 6:00pm PDT

[Image via Instagram.]

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