1) Let me practice on your head
例句：Hey,either you stop criticizing my cooking or I start practicing on your head.
2) Any of you ladies up for a game of monkey in the middle? up for sth.
例句：It's a long hike to the top of the mountain.Are you sure you're up for it?
I've been working all day long.I'm really tired.I don't think I'm up for going out with you tonight.