I dare you.
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Hahaha my face blew up like a balloon X-D
I think I've seen this before, so I will not be falling for it!
If you cheat...
Yeah you can. You can hum in the back of your throat, it's just really hard.
or open your mouth
That's not really humming though.
Humming: to sing with closed lips.
due the simple fact that i blow all air out of my right lachrymal gland/tear duct i am able to do it, thought it sounds like a teapot taht is done heating the water
I can do it.
Did it for 5 seconds!