Is That Weed on the 'Neighbors' Set?

ET's Brooke Anderson drops in on the Neighbors set with Seth Rogen, Zac Efron and their co-stars to get the skinny on their upcoming comedy -- and why they're surrounded by loads of smoke and weed! Watch the fun video and share...
Rose Byrne, Christopher Mintz-Plasse, Dave Franco, Ike Barinholtz and Jerrod Carmichael also star in the outrageous comedy about a young couple suffering (Rogen and Byrne) from arrested development who are forced to live next to a fraternity house after the birth of their newborn baby.
Directed by Nick Stoller (Forgetting Sarah Marshall, Get Him to the Greek), Neighbors moves into theaters May 9.