my go-to answer is always "My yeast infection really is bubbling up."
Students will most likely answer the color) Then you say, "yes, that's one difference but there's another: The White Sox play in Chicago and the Red Sox play in Boston!
Answer in comments so you can fully appreciate the joke)
One's a cunning runt.....
A quarter-pounder with cheese
He doesn't know he's black.
Smiles Edgeworth
Now you're just some bubbles that I used to blow.