There might have been a couple nosebleed seats in the balcony left at last night's very well attended Michael Showalter and Michael Ian Black's Somerville Theater show, but, for those of you who missed it, you really missed a treat. As evidenced by various available YouTube clips, Black and Showalter are extremely funny on their own, but together they brought humor to an entirely new level. The two have been comedy collaborators for 20......