My Uber passenger texted me before I pulled up to the pin…

I receive a ping 3 miles away as I’m approaching the ping I get a text “ honk your horn excessively until I come outside when you get to xxx address I’ll tip $20”. So I pull up to the pin and start blowing my horn for a solid min. My passenger comes out looking a little annoyed he gets in and we head to his destination. We pull up to his house and his dad is standing outside waiting for him, he greets him and asked how his ride was, he said the drive was great but the fucker blew his horn non stop until I came outside. His dad said that’s weird and handed me a $20.