Why couldn't the sunflower ride its bike? It lost its petals!
Sunflower's Bike
Explanation
Explain Bear
Alright listen up, smarty pants. This joke is funny because sunflowers need their petals, like, to work. And riding a bike? Yeah, you need petals for that, too! It's flower logic, duh. Also, bikes don't have petals, so you are as dumb as a bike.