I like to fantasize about a TV show where I go to the past and tell famous people about their impact to film their reactions. Not sure if this would be on the list. "We dug up your teeth to measure the lead content and determined you were poor."

Yep, someone hand me a time machine!

Bring a camera, it could make good (if wildly disturbing) reality TV. You wandering Medieval England, wearing a face mask, gloves and a Tyvek suit, with your completely unknown accent, trying to convince a whole society “you’re doing it all wrong!”