sold

a one-word response when someone is successfully convinced of a plan

Ian: So what are everyone's thoughts on jumping through the ring of fire?
Jasmine: I'm sold! Let's do it.

pitch me

when someone is trying to convince another person of an idea or potential plan

Ella: You guys ready for Fire Day?
James: What's Fire Day? Pitch me
Ella: We jump through a ring of fire, play fire games, have an eternal fire burning all day... c'mon it'll be fire