By John Lyle Belden

Comedy works best when the comic has someone good to play the jokes off of. In “Tonight, Tonight,” the improv talk show, that person is you!

Mark Cashwell is attempting the TV talk format as a one-person show, no sidekick or bandleader, and the tech in the back is mostly there to play music for the dance breaks — there are dance breaks, you will dance.

You could also be “Tonight”s guest.

To be honest, this show only works if you help make it work. But when you do, the result is hilarious fun.

The show also includes breaks for “commercials,” when familiar local radio ads get skewered.

So give Mark your time, some suggestions, your funky moves, or even silly answers to “What’s your movie about?” and he will give you a highly entertaining hour.

Remaining performances of “Tonight Tonight: An Improvized Late-Night Talk Show” are in a few minutes — 9 p.m. Thursday, Aug. 24 — and at 6 p.m. Saturday and Sunday in the downstairs stage at the Phoenix Theatre, 749 N. Park Ave.

Festival info at www.indyfringe.org.