Columbia Pictures released another funny clip titled “Dumpster Escape” from the upcoming comedy “Pineapple Express” by director David Gordon Green and starring Seth Rogen (The Green Hornet, Fanboys) and James Franco (Spider-Man 3, Milk) Plot: Lazy stoner Dale Denton has only one reason to visit his equally lazy dealer Saul Silver: to purchase weed, specifically, a rare new strain called Pineapple Express. But when Dale becomes the only witness to a murder by a crooked cop and the city’s most dangerous drug lord, he panics and dumps his roach of Pineapple Express at the scene. Dale now has another reason to visit Saul: to find out if the weed is…