Trust falls? Rap sessions? Giggle weed? I don't know what tools of the trade Paul Rudd and director David Wain share to dream up the kind of inspired nutso stuff Rudd has done in smart-funny-raunchy winners like "Wet Hot American Summer" and "Role Models." But whatever it is, the two are in a groove -- and backed up by some blissed-out creative co-conspirators -- "in Wanderlust."