While a classified ad might seem like an unlikely source for a film, Safety Not Guaranteed embraces its premise and runs with it in surprising directions. Yes, this is a film about a goofy guy who's looking for a partner to time travel with, but there's a lot more going on. It treats its characters earnestly and explores their respective searches for love with sincerity and some good-natured ribbing. Safety Not Guaranteed is a comedy, after all, but it isn't one that will likely have you rolling in the aisles. Humor, instead, arises because you care about these people just as much as their quests to get laid and — er — steal some lasers.