WATCH: Why Wouldn't You Do This On A Plane?

You always hear about the toenail clippers, and teeth pickers, but how about this guy??

A video has been shared on the Instagram account Passenger Shaming of a United Airlines passenger...Shaving his head during a flight.

While a few passengers recorded what was happening, you can see a few flight attendants walking past...and they don't seem to mind. 

I...just...WHY?

What would you do if you were sitting beside this dude?

Imagine catching a flyaway hair from him? No thanks!

-Jess