T-Rex: Albert Einstein: scientist, physicist, and...

T-Rex: ...SECRET TIME TRAVELLER??

T-Rex: Who can say? Secret time travellers are by their nature incredibly secret, and also impossible to detect, because if you DO detect them then they'll go back in time to make sure you don't do that anymore. Therefore, like all things that are unprovable, this theory could TECHNICALLY be true!!

Utahraptor: But the fact you're saying it proves it's false.
T-Rex: How so?

Utahraptor: Because if it WERE true, Einstein would want to keep his secret, so by your own logic he'd travel through time to prevent you from revealing it. Therefore, by definition, anyone you can credibly claim is a secret time traveller... isn't!
T-Rex: GAAAASP

Narrator: THAT EVENING, T-REX SPEAKS INTO THE DARKNESS:
T-Rex: Einstein! Are you there? Your secret is safe with me!
T-Rex: PRIMARILY DUE TO YOUR GODLIKE COMMAND OF TIME AND SPACE??