What older bottle(s) have you stood up recently? For a special occasion? For no reason in particular?
For newer folks, older wines with sediment should be stood up in a vibration-free area for a period of time (I like a week or two, some do more), so the particulate matter can settle out. Then, the wine can be carefully poured into a decanter for drinking, leaving the gunk at the bottom, where it belongs. The sediment won't hurt you of course, it's just not that fun to drink.
Just stood up a 1988 Leoville Las Cases yesterday. Very excited to try this one, and I'll find a nice day in September to have it with my wife.