To Devon, I'm pretty sure he pocket dialed the dude, and didn't mean for this to be heard.
That said, I tip on pizza delivery because they are spending gas money, and they don't get a car allowance. I tip waitresses because they only make $2.13 and hour, so they should be compensated.
And, I had a buddy in college who delivered pizzas in the summer. Well, he had a book he carried with him to write addresses in for lack of tipping, something he could steal from their house later, etc. When one time he delivered to these folks out in the boonies and they tipped him $.11 change and dropped it on their porch and laughed, the next time they ordered he took the pizza in the bathroom with him, took a shit, and smeared the shitty toilet paper on the pizza. You never know what kind of twisted fuck you'll piss off in this life.