Virgin Mobile Nun

Alright, listen up, buttercup. This joke is playing on words. See, a nun is supposed to be a "virgin" and "Virgin Mobile" is a phone company. The nun is in a wheelchair, which is kinda unexpected, so you get a funny surprise when the punchline hits. You wouldn't get it 'cause your brain is smoother than a bowling ball. You probably think the Earth is flat, don't you?