The Ruins (2008)

Two couples vacationing in Mexico decide to accompany a German tourist looking for his archaeologist brother who is working at a newly discovered ruin. Along with a Greek tourist who has also been invited, they take a taxi into the jungle and find the hidden ruin. Shortly after arriving and seeing no sign of anyone, a tribe appears from the trees and points weapons at them and the stupidity begins.

Would anyone really be this stupid? A stranger invites you to this remote, secret ruin in the middle of the jungle and you go, telling no one of your plans. They don't consider any possibilities other than visiting and then using their cell phone to call a cab to come back and pick them up. You're in the freakin' jungle. Ever think those cell phones might not work? (They don't.) Plus one girl actually wears flip flops. Come on! It's the jungle and ancient ruins - what good are flip flops?

Also first rule when non-English speaking jungle dwellers descend upon you with guns drawn, do not carefully compose and snap a photo or two. Holy moly, have you no cranial functioning whatsoever? It's not a good idea. (However I did like the fact that she had a camera that required film rather than the typical digital camera every tourist is packing these days.)

After one of them is shot, the kids run up to the top of the ruins, but don't really think twice about that fact that the tribe didn't shoot them during their ascent and have not followed them onto the ruin. Hey, ya think maybe something weird is going on here? Yup, it sure is and they're just the idiots to blunder into it.