Why don't rappers use the subway?
Because they don't want to miss their next rhyme.
Rappers and Subways
Explanation
Explain Bear
Listen up, buttercup. Rappers like to rhyme, right? And "rhyme" sounds like "ride." But if they're underground on the subway, they might miss their chance to come up with a sweet rhyme. It's wordplay, something smart people like me are good at, but you... well, stick to counting your fingers and toes, cupcake.