I see the joke! "scratch" and "joint". As in "Pork scratchings" and "Pork joint", right?

Well, the third little piggy, The grade A student, his daddy was a rock star Named Pig Nugent, earned his master's degree, From Harvard college. Built his house from his architect knowledge. A tri level mansion, Hollywood hills! Daddy's rock stardom Paid for the bills!

Oh, I just followed the coastline looking for clay, dug it up, baked the clay balls in a furnace made of cobblestone and, crafted brick blocks and built my house with them!

Extraordinary idea! I dig it!