I've said it now but feel awful.
Sunday dinner in garden. Grandad and BIL also in attendance. DS is 5. Refused to sit properly, kept shouting and screeching, refused to use knife and fork, breaking up potatoes with his hands.
I took him from table and told him to sit in kitchen until he could behave.
He eventually came back to table but still wouldn't sit properly and finally through potato and fork across table.
Dinner went in bin. He is now sobbing because he'd hungry.