"Happy Birthday! How does it feel to have squandered another year of your precious life under the same fluorescent bulb? May there be many more!"
"Hi, I don't know anything about you outside of the fact that we spend 40 hours a week in the same room. Good Luck for the rest of your life, because this is the last time I'll be a part of it."
It's worse than signing yearbooks. In protest, I have signed today's card-for-a-stranger: "Have a neat summer -Megan"