I let the curses fly all the time once I start hitting bad shots....the more bad shots I hit, the worse and louder the foul language gets and I will throw my clubs sometimes. Not after the 1st. bad shot though, with me, it's a growing frustration around the course. By the time I hit my 5th or 6th bad shot, thats when the clubs start flying and anyone within earshot gets to hear my bitching & moaning & every curse in the book.
Like the poster above said about the pro's missing a shot and it's thousands of dollars lost, I never really thought of that....my thinking many times is "I actually paid money to get this frustrated and pissed off"....I can't imagine losing a new car or something similar....I could NEVER go pro if that's the case, LOL
I'm really trying to control it though and be much kinder and gentler....it's a work in progress