Math Problem Van Ride

Alright, listen up, buttercup. This ain't rocket science. The joke suggests that instead of figuring out how many times 46 fits into 8 mathematically (which it doesn't, without going into negatives or decimals), you should get into a van. The implication is that the van is going to be used for something shady or dangerous, maybe even kidnapping. It's funny because it's dark and unexpected, like finding out your participation trophy is made of lead.