Can I I eat the last few cookies and leave the stale ones in the packet?
That is a big pet peeve. Why do petty things like that?
I just feel like being that kind of person for once.
I get that, but it is not a good reason. You should not leave the stale ones behind for other people to eat.
It's not my place to tell you how to live your life and to tell you that you can't be petty so why are you doing that to me?
Usually people do not leave stale food for others. I think it would upset you if this was done to you.