"My chair is broken. May I use your extra one?" "I don't have an extra chair." "Sure you do. It's right there." "That's not an extra chair. It's my guest chair." "Okay, whatever. The point is that the base broke off of my chair." "I can't sit on a chair that has no wheel base. It's unstable." "Stop being a baby. Just turn your chair upside-down and it will be totally stable." "When did your chair break?" "Last spring. You get used to it."