Wallace (Daniel Radcliffe) and Chantry (Zoe Kazan) are adorable yet highly articulate types navigating hipster Toronto. He's a med-school dropout on the rebound, she's a cartoonist with a live-in almost-fiancé. Much of this charming but lightweight romantic comedy from director Michael Dowse (Goon) goes down like ice cream: The dialogue is fast and funny, the performances engaging, the milieu fairly credible and reasonably fresh. Eventually, the genre's seemingly inescapable tropes — cute situations, wacky buddies, can't-we-just-be-friends conundrums — get the better of things. But What If is 100 minutes you'll quickly forget, yet not regret.