I think there is definitely a flippant tone to most exclamations.
Don't cross that street!
"lol watch me"
compared to;
DON"T CROSS THAT STREET YOU MUTHASUCKA
"woah k"
i exclaim many times throughout the day but when i am kidding i use more than one (!!) or something.
I love 'em!
Excessive use I can't take seriously. But just one is fine
Once in a while I can, but usually I just laugh if they are trying to be serious!
asdfghjkl;'
Sometimes I walk around with an exclamation point over my head like the guards in Metal Gear Solid!