After one of Raj-Sing's subordinates witnesses his Heroic Sacrifice and celebrates that the Himalayan safe zone was genuinely safe: "Then he whipped out his penis and peed in my face." Right after a lone monkey watches him, contemplating, stoically, almost thankfully on Raj-Sing's sacrifice, or so the subordinate thinks before he's weed on. Indian monkeys know when to ruin a moment.
After being stuck in space, alone, for 5 years without resupply, a rocket (specifically, Virgin Galactic, the private rocket group) finally is launched to the ISS. The first thing the rocket's captain says is "Did anyone order takeout?"
A former White House chief of staff who ignored the various warnings that the zombie apocalypse was impending has a new job after the war is over... shoveling manure.
The Zombie's tendency to click their teeth repeatably.
This is apparently a widespread reaction. There are quite a few reports of audiences bursting into laughter when the zombies do that repeated chompy-chompy bitey-bitey at nothing motion.
Not to mention the hospital zombies' tendency to hunch over and make strange noises that make them look for all the world like chickens.
"Looks like we just woke the dead. In that respect, uh, please turn off all pagers and cell phones."
A Black Comedy one, when Gerry asked where the documents are, the soldiers replied "you're free to look". (They were burned along with the zombies.)
Well Gerry, you just became invisible to zombies. Whatcha gonna do? Drink a Pepsi!
Although completely understandable considering he's been without food for awhile, been under extreme duress and endless escapes, and just infected himself with a disease. Given that he finally has a chance to catch his breath, and is near a distraction he'll need anyway, it's funny in its humanness that he opts to drink one before carrying on.
Hey, it's probably going to be a while before anyone gets back to making soft drinks, so why not?
Mexican audiences loved the "Mexico City has been declared a total loss" bit near the end of the film. It's like a "P.S., Just in case you were wondering."