0. E = MC^2, thats E for energy, M for mass and C for speed of light!
1. No matter can excede the speed of light
2. Speed of light is constant for all, irrespective of their motion.
3. You can not go back in time and have sex with elvis or anyone for that matter!
Some parts of the theory are still unproven practically, but only proven theorotically
Girl 2 : Sorry babe! Einstein won't let ya!
Girl 1 : WTF is this enistein?
Girl 2 : Read this you dumbass, E=MC^2.. and so on..
Girl 1 : So its all because of the bloody einsteins theory of relativity, damn
Girl 2 : And we can't do anything about that bastard!