tmi: work edition

i know that if you are in an elevator alone with a coworker you are obligated to make small talk with each other. but please, don't bring up that you've been in several different positions cause you keep getting "layed off" in response to "how long have you been working here?" or that they "keep trying to get rid of [you]haha." it is just awkward. and i don't know how to respond, except with forced nervous laughter.