Another advantage is that when punching, the thumb will not get caught on an object as opposed to having the thumb sticking up or out.

The German officer was a plump specimen, red-faced, thumb stuck in his belt.

Little Mary sat beside her like a doll, her thumb stuck solemnly in her mouth.

His thumb stuck in a 16 lbs bowling ball.

She stared at the backseat where her daughter clutched her beloved stuffed bear, a thumb stuck firmly in her small mouth.

Both cops were smiling, rocking back on their heels, thumbs stuck into their gun belts.

Oh well, I suppose if you get your thumbs stuck in your trousers you could always tell her how you feel.

There was a noise behind him, and a stout man wearing a sergeant's uniform came out of nowhere, his thumbs stuck in his leather belt.

A thumb stuck in various parts of the pie, however, pulled out many a plum.