'The Pajama Men' at Woolly Mammoth: Loony, indescribable fun

When an audience gets hit with a sustained case of the giggles, how can you adequately describe what's causing it on stage? Because in "The Pajama Men: Just the Two of Each of Us" at Woolly Mammoth, it's not much. Just two guys in pajamas, zipping through bizarrely linked skits and talking in funny voices.