Well I have only been driving for 2 months, but, plenty of mistakes to go around
My biggest, was in NC, I just got off of 77 onto 85 sb at 5:00pm, Charlotte traffic was quite heavy, and traffic was moving better in the second to right lane, all of a sudden I hear on the radio, "Hey swifty, how far you think your gonna get running the weight station?" I look over, and sure enough, there I was passing the weigh station entrence with too much traffic to even consider getting over! Needless to say it was a nervious 30 or so miles to the SC state line, never got ran down though...
Another time I was in texas, and there was road construction on a bridge, so they had a rather long detour around the interstate, made it all the way back to the interstate with one more intersection to turn at before getting back on, and a bear was directing traffic, well I had a 4 wheeler flash back from thinking about the bear, and made my turn a little to sharp, making a lovely scraping sound as my trailer got to know a concrete road barrier a little better then it should have, the cop just looked at me and shook his head as we waved me on to keep going (No damage was done, just scraped it)
Was at a pilot fueling up, was rainy as hell, and I learned a hard lesson about how slippery steps get when you mix rain and fuel :P
And finally, NEVER leave your windows down all the way and forget to tie down the window curtain!!!