From a friend of mine:

Three kids are in school…a Mexican, a White, and a Black…
The teacher tells them to make a sentence with liver and cheese.

White kid says:
“My mom made me a liver and cheese sandwich and it was sooo good…”

Black kid says:
“My daddy told my momma to go get the Government cheese and she didn’t, so my daddy punched her in the liver…”

Mexican kid says:
“Some kids were trying to look under my sister’s dress so I told the vatos ‘Hey!! Liver alone. Cheese my Sister!!!’ ”