Seth Rogen and Zac Efron had trouble stifling laughter when they appeared in “Ew!” a recurring “Tonight Show” sketch starring Fallon as a teenage girl, Sara. After taking a selfie (ew), dancing to “Turn Down for What” (double ew) and debating the merits of Gary Oldman’s acting career, the three ended their night with a round of texts from a creepy guy named James Franco.
