This series has done its best work this season, by adding Katie Findlay as Lucy, the steady girlfriend of Jay Baruchel’s otherwise unlucky-in-love Josh. As their romance has escalated, so has the comedy – and tonight, now that they’ve decided to get married, the humor threatens to explode, literally, as the young couple set out to inform their respective parents. No show on television deals with funnier, more physically embodied metaphors than Man Seeking Women. For Josh’s mom (recurring player Robin Duke), for example, the delivery of the invitation is volatile enough to require a robotic delivery system…