Where madness begins?

In General, this situation is going from work, one through the Park, the Park is well, quiet, you can hear the birds are singing, young mothers walking with strollers, seniors sitting on benches and next slowly strolling couples in love, just peace and quiet.
And amidst all this idyll I wanted stupidly to scream AHHH!!!! To hood up, hands in his pockets, to go freaky gait, to bend the head down, to go and stupid yelling AHHH!!!!
And when I thought about it, I was wildly funny, had only to imagine it, the cute pattern violates savage scream and all at once look at each other, what's the matter, smile spontaneously appeared on my face.
From the side you might think - what the freak is sick what is or stoned, and perhaps drug. Well, I would think, if the brow has seen, perhaps even chickened out of it. And this thought amused me.
And that's the only thing that kept me not to yell at the whole Park is the idea that suddenly after this action, when going alone in a circle full of people and you're yelling like a crazy man, thereby you cross that fine line of insanity, where you're neither who you are, and you will become crazy.
And perhaps even you yourself will deny that, keep thinking I'm just kidding but the shift has gone, not visible to you, but visible to others. And after this action back to normal I will be gone? Who thinks that?
In the end I began to scream, the rest of the way I was thinking about it.