Is Time Travel Possible?

Evidently, time travel is possible if you eat enough Doritos. This commercial was shot by amateur film maker Raj Suri for $200 and took eight hours to complete (read more here). It won Dorito's "Crash the SuperBowl" contest and is very funny (I love the yellow lab with his face in the Doritos bag).

Time travel is a complex concept (see the issues here) and requires violations of causality to accept. My favorite "impossibility theorem" is called Presentism which argues that neither the future nor the past exists and therefore there are no "non-present" objects you might return to or go to in the future.