Long-form musical improv comedy: It's the improv equivalent of juggling chainsaws, bowling balls and flaming torches ... while riding a unicycle. In other words, it's a very tall order to pull off, writing lyrics and melodies on the fly, while stitching together a story that features real moments of humanity, killer punchlines, and multiple wig changes. But Mansical accomplishes it all with astonishing, mind-blowing élan (and lots of wigs). From a solitary thread of an audience suggestion, seven veteran music improvisers spin an entire tapestry of vibrant scenes and textured songs right before your eyes. Behold this truly thrilling production live at Under the Gun Theater.