My dad once felt a sneeze coming while brushing teeth. He tried to suppress it and closed his mouth, resulting in a mouthful of minty toothpaste pressure-washing his nose.

He didn’t recommend this experience at all, besides the burning agony that lasted quite a while, crumbs of dry toothpaste kept falling out of his nose for like a week sporadically.

Or press the tip of your tongue very firmly against the roof of your mouth. Helps me mitigate sneezes

Fun fact: in Germany, the 70s series „The Persuaders“ has cult status because of this. Everywhere else it kinda flopped, but the German dub is soo hilariously nonsensical that everybody loved it.

The people that were in charge of the dub are the same as for all the Bud Spencer and Terrence Hill Movies.