Chain Jokes

Onions have had a long process in the evolutionary chain. They have evolved into today's onions from onionderthals.
I have an idea for a chain of Elvis steak houses.
It will be for people who love meat tender.
If there's a Tim Horton's chain, should there be a Lanny McDonald's? Or Doug
Harvey's? And what about Ron's Francise?
How do knights communicate?
They use chain mail.
Why did the football referee have trouble measuring the first down?
Someone was yanking his chain!