Top Ender Giggles - How to negotiate

"I've got a great idea Mummy!"
"Every week when Dad is at work we should eat pasta on one night and take out on the other!"
"That could work out expensive Top Ender"
"I don't mean every week, maybe every other week"
"Maybe once every three weeks?"
"Once a month?"
"Once every so often?"
"Yeah, that sounds about right Top Ender"