I highly doubt many of these lines would work. The funny ones are good but saying stuff like "I'm not your monkey! NO!" would make them not like you anymore and feel like you said to them personally "Leave me alone! You're annoying!" so I wouldn't say any of those. I really like the bird joke with the hat but wouldn't it be cool to then turn that into an actual trick and produce something. When everybody's laughing at the bird joke take and conceal something large in your hand and produce it from the hat such as an orange or even a bird if you have one. Wait...who would freaking have a bird randomly on them. Anyway you get my point. I like "Magic...trick?" and "I don't know magic". It's just gives you enough time for them to go in their head "WHAT!?!" and by that time you're gone and they're laughing. Please people, stop giving bad advice like "Hit them and call them bad words hyuk hyuk! Works every time!!!" We know that doesn't work so stop!
saying no works just fine
they should know that you arent there to perform for them on their whim
let them know once that you arent there to perform exclusively for them on their shedule.
tell them, "no, ill perform when i want to, not when you say"
theyll be stunned from the reaction and walk off or continue what you were doing. they now know that youll perform when YOU want to.
it does work everytime for me, im in highschool and it works, but hey, what do i know, ive only been using it for around a year and its worked everytime.