I need to solve a puzzle to be allowed to sit down in a room with other programmers and code? You've got to be kidding me...
I'd rather buy a coffee at a coffee shop, I could care less about 'posers' I do have other things to talk about besides whether ruby/php/python is more scalable.
At least the coffee shop isn't trying to disguise selling coffee as recruitment, pretty soon your local microroaster will be holding 'baristathons' and asking obscure questions about coffee to weed out the 'posers'.