Sunny from 2008, just coming off the Obama election high, interviews her 2012 self who has experienced four years of Obama:
We should check if there are lots of news reports of Obama supporters being punched in the face by mysterious people. That would be evidence time machines are eventually invented.

Oh, Sunny, that’s off-the-charts good!!!
“…and they extended their middle finger.”
Bwahahahahahaha!
That was ‘share to Facebook’ good!
So I did.
Unfortunatly, the mysterious punches would have happened in 2008, so I think this is irrefutable proof that time travel is not possible.