Turns out, it's pretty hard to tell the difference between a ska band and an improv troupe.
Gregg Gethard, comedian, brother of Chris and co-host of NBA-centric podcast Holding Court, came to that realization one day after some mindless Google image searches (been there, done that) showed that both tribes have an affinity for coordinated outfits, cheesy poses and young white dudes. The enterprising Gethard did what any self-respecting person on the Internet would do and started a Tumblr, 'Ska or Improv,' that encourages you to guess which is which. Through some reverse Google image searching, we discovered the truth. Answers below. We are shocked .
Top image: Ska band. Middle and last images: Improv groups.