Everything. These two objects have nothing in common.
When you twist the doorknob it doesn't scream.
A podiatrist bucks up your feet.
Don't be silly, walruses don't make sandwiches; women make sandwiches. Made this up to bug my sister. It worked. Her husband laughed.
Subwhey.
The Circuits! (this is a joke i made up when i was like 10, i don't think it ever caught on)
They all have transisters.
A Hun knee comb.
Rivets.