Oh man, I could do that as a kid.

I could also somehow blow bubbles out of my eyes whilst underwater. I would stick my little fingers up my nose and clamp my mouth shut then just try to breathe as hard as possible.
My mum was not very happy when I showed her. Thought I was going to do myself some damage, and she was probably correct. Then one day I just stopped doing it. No idea if I can still do it.
Thank you for reminding me!!