When I was a kid (hell I still do it now) I would dream about going back in time and becoming a great inventor.
The caveat is that your invention has to be made with the local technology. You can't bring a gun or iPad into Rome because you wouldn't have the technology to manufacture it.
So things like inventing the compass in Ancient or bringing the Arabic numeral system are fair game for Ancient Rome.
After many years I thought about it, and I think I would go back in time an invent French Fries in Ancient Rome.
>Be 100A.D.
>Invent way to deep fry potatoes
>Plebs love it
>Sell McDonalds style fries and build up to burgers
>Become wealthy beyond Crassus's dreams
>Senate invites me to join in as McSentator Tatercus
>Bribe more Senators and begin to pass laws granting me an monopoly of food for the games
>Marry into the Caesars
>Bribe some Praetorian Guards to install me as IMPERATOR
>Become CAESAR AVGVSTVS
>Sell burgers beyond Italia
>Become the wealthiest man in all history.
>My name will be forever known
So what would you do?