Make it look like it was vandalized by college kids. Then put stickers over the vulgar parts. Come up with a great story about how you feel asleep at a bus stop and then had to try and make it work safe again.
That’s the joke though. He makes the ridiculous claim that he has a taking cat. She’s skeptical. She sees evidence to make her think the guy is a fraud. SURPRISE, it’s a real talking cat. That’s the twist.