What Happens if an Astronaut SNEEZES in his helmet during a spacewalk?

Lord I hate to say this but I am compelled by an ancient sprit from my youth , "May sound funny but it'Snot."

If an astronaut sneezes in his helmet, someone will probably say "Bless you" or "Gesundheit."

Hope that helps!

NASA has come up with really an ingenious solution to this problem outside in space during space walks etc. There's a small set of thumb screws on the sides of the Astronaut 'glass' that with a few simple twists of each screw he can remove the entire assembly, wipe it off and pop it back in. It only takes about 6 or 7 minutes to remove all the screws with 'space gloves' on - and as long as none of the six screws floats away, has a nice clean view in no time at all.

You hand him a tissue.

Well, he'll likely get some saliva or mucus on the inside of his visor.

Where you expecting something else?

Here’s what an astronaut said: https://www.space.com/7026-sneeze-space.html