Take too hard a pull, miss the end of the train, get dropped - check
Try to catch a breakaway, run out of gas in no-man's land, get dropped - been there, done THAT
Not pay attention when the group accelerates, get dropped - Yup
Get out of position in the crosswind sections, get dropped. - Something for me to shoot for...

Don't forget my favorite: Take a long pull up to the base of a steep hill, bonk on the ascent, get dropped