OH My...then we are all FREDs. I ride 99% of the time by myself...and the yelling ranges from yeahhhhh to 'the four letter kind'. I just can't help it!

One thing I think you don't find (other than maybe hill climbing?) is that mtn bikers, or the ones I have ridden with, often like to whoop it up with you ...It's a great feeling to impress yourself, but also to impress and get compliments from other riders! So chatter and whoop away!