Hilariously, the pizza stayed there for several episodes, practically becoming a new character in the show. You know what's not hilarious, though? When literally anybody else does it. When a bunch of drunk frat boys roll up to the very real New Mexico home and lob hot cheese pies at the roof, it's not a joke; it's trespassing and vandalism. If you do this, Breaking Bad creator Vince Gilligan personally thinks you're a prick, pizza-slinging guy.
"Aw crap, what am I gonna do with a pizza now?" -- a monster
This "joke" got so out of control that actor Jonathan Banks (who plays the sexagenarian hitman Mike) threatened to "hunt down" those who did this. That's an outcome the home's owner is desperate to see, judging from this sign: