"Yes, Potter, because that is one of my greatest dreams, ever since I was a child, I've wanted to be a cowboy and wear spurs and denims while spitting in a spittoon with a saloon girl on my lap. I'm shocked that you hadn't noticed my deep longing before."
Awesome repartee, and great Snape voice. I also love the adult snarky Harry voice.
But whatever gave you the idea of Snape in tourist trap Tombstone? So incongruous and funny!