This hard question comes from a really old SS sketch and it's sort of related to the Muppets, so here it comes:
As I was going to St. Ives, I met a man with seven wives and every wife had seven sacks. Every sack had seven cats and every cat had seven kittens. Kittens, cats, sacks, wives, how many were going to St. Ives? Really think about this one.
BONUS: Who was buried in Grants tomb?
I know these are generic brain-solving problems, but don't worry. I will come back to Muppet questions after this one.