A friend emailed, said he’s Scotch

Scotch is a form of whiskey. The people are Scots.

I replied, “How that got into your ancestry must be an interesting story. Does this mean you’re immune to hangovers? Do you have to pay alcohol import duties on yourself when you travel? Are you flammable?”

He hasn’t responded yet. Maybe someone poured him back into the bottle and he can’t get out.

Don’t be stuck in the bottle. Grammar matters.