"That's what it's all about. That magical feeling when you're out walking in nature and you see...Oh man! Is that a unicorn!? That's so..oh wow. You're just gonna do that right here? Alright then. Do your thing, Unicorn. Do your thing."
This is exactly what people will say when they see this shirt coming towards them. Hopefully the lesson is learned quickly before things escalate. You're the unicorn, and you do what you want.