Are you late?

lifehack.org: "If you’re not the one, you undoubtedly know people who show up late. Sometime they cause a group of people to stop their momentum while the latecomer is brought up to speed. Those on time drum their fingers (figuratively if not actually), change their train of thought and engage in other time filling activities while the latecomer is briefed. I have heard those who were interrupted mumbling under their breath, rolling their eyes, and give other negative feedback – even if the latecomer can hear or see them."