My first idea would be a chat show with a QI theme, perhaps bringing celebrities or guests onto the show, asking completely random questions and talking about completely stupid things, like watermelons.

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'That's a cool idea. I would definitely listen to that.'
'that sounds funny, i would love to listen to that!'

My second idea would be a game, movie and TV show themed comedy show, making jokes about anything possible or reminiscing on the stupidity or inaccuracy of what goes on in them.

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'This sounds hilarious. I think that it would be easy to start with but may possibly run out of jokes...'
''this sounds extremely hilarious. i would enjoy listening to that every day of my life'

My third idea would be when the public ring up and we have a few rounds of quick fire questions which no one would ever know, like 'WHY IS MY HEAD MADE OF MAYONNAISE?!' and generally scare everyone who rings up for an hour or two.

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'I would definitely be up for that idea. To get people interested, you should give a prize to people that actually get a question right.'
'this idea seems interesting, i would enjoy listening to it and i would like to hear peoples reactions to the strange questions.'