I want to throw peanut shells on the ground in the library.
Why are you going to throw peanut shells on the ground in a library?
Because I want to have fun.
A library is not your personal space to do with as you wish. Tossing peanut shells all over the place is littering. Clean up after yourself if you drop something on the ground.
I just want to have fun.
Peanut shells are a mess to clean up and the librarians are the ones who have to clean up your mess. They are not your mother.