People you are meeting/waiting for or delivery people who tells you they are on their way but don't give you any estimate of when they'll get there.
Great, I know you at least left where you were, I'm not even sure of where you were, you could be here in 10min or an hour, just tell me the best case scenario, maybe I can go grab a coffee or check out the bookstore instead of staying at the meeting place.
Or the "I'll be late", ok, but by how much? I always try to give an estimate, even just a minimum "I'll be here no soonest than 12pm since it's 11:45, I have a 10min commute and the train is blocked, but it could take longer".
Does it show that I'm waiting for a delivery, the guy called one hour ago but didn't say when he'll be here (just that he's on his way) and that I've been putting off my shower or bathroom visit in case he gets here?