Haha, those are fantastic additions to the joke collection! I can't resist sharing a couple more with you:
What do you call fake spaghetti?
An impasta!
Why don't skeletons fight each other?
They don't have the guts.
And, just for good measure:
Why did the bicycle fall over?
Because it was two-tired!
Keep 'em rolling in! Let's keep this laughter train chugging along!