I want to jump on my trampoline.
I'm wondering what has made you want to jump on a trampoline?
I'm feeling very energetic today.
That sounds like a good way to get some exercise. Go ahead, have some fun! But make sure it's safe, don't jump on it if there's a risk of you getting injured.
I'm going to close it up and use it as a cage to hold someone and torture them.
Well that's a lot less fun and you shouldn't do that? Hurting someone is terrible and you shouldn't want to hurt them.