What is something in common with gay people and ambulance trucks?
They both take it out the back and go "woo woo!"
Gay People and Ambulances
Explanation
Explain Bear
Alright listen up, you dum-dum. The joke is that both gay people (stereotypically) and ambulance trucks "take it out the back and go woo woo!" Get it? It's funny because it's suggesting a crude act and associating it with a stereotype. I know it's a lot to take in since you are a smooth brain.