“Everything is covered in feces!”
In the latest episode of Glove and Boots, internet puppets Fafa the Groundhog and Mario list off 10 reason why time travel is no good. They hit on everything from the earth exploding if you meet yourself in the future or past (Back to the Future) to always ending up naked once you arrive at the time travel destination (Terminator).
I posted this 5 years from now. (In the future.)