Trying to be more social with co-workers lately, reading self-help books on this. Back-fired twice in one day.
1) Trying to strike up conversation with a co-worker in the photocopy room "You're going to so and so's party tomorrow, right?" only to hear "What party???"
2) Ran into a co-worker on maternity leave with the year-old baby in tow and commented "Wow, he's getting big" only to hear "It's a girl."