Tom scrunched down.

He scrunched down in his seat so that I wouldn't see him.

The “rolling on the floor laughing” emoji is a yellow face with a big grin and scrunched, X-shaped eyes, tilted on its side as if rolling on the floor laughing.

His face scrunched up.

Mary scrunched up her nose.

Tom scrunched up his nose.

I scrunched down.

Mary scrunched her nose up.