Never happened to me, but I can bet swinging a golf club would alter your game. I don't know how the women golfers do it. It's natural for them, but if I all-of-the-sudden had even a C-Cup I think it would be difficult to golf (and I am not really a golfer).
I can now better understand the difficulties women have with some things because of breasts. The same goes for tight skirts. Can't spread your legs too much without ripping the material. These are things average guys probably never consider, but being a CD it all comes to light.