Tip of the day: When you donate plasma and the lady takes out the needle to gauze you up and send you on your merry way, make sure she actually puts the gauze right where the needle was inserted and not slightly to the left. Otherwise you get to the parking lot and your favorite light sweater looks like this.
And BONUS tip of the day is to immediately soak your blood stained sweater in hydrogen peroxide and dish soap. It totally works! Thanks to my plasma buddy Davina for mentioning that one. I guess I don't have to spend the $30 I made on a new sweater after all.