Why do guys whistle?

I hate people who whistle, it's my pet peeve.. I want to seriously kill everyone I hear whistling.. It's not like I start singing in the middle of the grocery store when I'm picking out vegetables... I'll make eye contact w a whistler, and just stare them down, until they shut up.. It's SO annoying, and it makes me f***ing crazy! So guys, what do you find so great about whistling.. Is it for attention, are you nervous? Do you want people to guess the song your whistling? Do you want me to strangle you in the middle of super America? Maybe I hate whistling because I'm a musician, and it seems like non-sense sound; maybe I have super acute hearing, or maybe I'm just really super special and have super powers... Reason's for this very annoying, obnoxious gesture, at unneeded random times please? Thanks...
Why do guys whistle?
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