When you try to wash a dish that you had recently stored or eaten baked beans out of, there's a nasty stain on the dish that takes a lot of scrubbing to clean. That is bean stain.
"You expect me to clean your bean stain? No, you do it yourself!"
"But it's gross!"
"Then don't eat beans!"
"NOOOOOOO! I NEED THE BEANS!"
Everyone thinks this is just a fruit, but the term "Pineapple" is druggie slang for psychedelic drugs.
Damn, I need some pineapples right now.