I love zombies. I love Seth Rogen. I laughed my ass off during both Neighbors movies. So I should love this Fear the Walking Dead promo for Neighbors 2, or rather this fake pitch for “Neighbors 3: Zombies Rising,” where Mac (Seth Rogen) and Teddy (Zac Efron) take on zombies. The fact that Seth Rogen wields a longsword and that he disagrees with Zac Efron on whether to dispatch zombified fraternity brothers seems like it could be hilarious. Except the whole affair is as sad and unfunny as the joke Rogen cracks in the promo’s beginning about accidentally killing his hamster as a child because he sat on it. What a letdown.