Here's the direct answer: the Cat Facts prank works on a coworker because it is anonymous, it is silent, and they can end it any time by replying STOP. No glitter bomb in the mailroom, no rearranged desk, no fake email from "IT." Just a text about a cat, arriving on their phone, from a number that isn't yours. You sign them up at catfactstexts.com, and the first fact lands within seconds.
Why is this the safest office prank?
Because it leaves no trace in the building. Nothing on their desk, nothing on the network, nothing a facilities manager has to clean up. Messages come from the Cat Facts number, not your phone, and we never say who paid.
The recipient always holds the exit. Every message tells them they can reply STOP to end the texts instantly. That one word is the difference between a prank and a problem, and it is why the joke has survived since the 2012 Reddit thread that started it. If you still have questions about the legal side, we wrote up whether the Cat Facts prank is legal in plain language.
Which coworker should you pick?
The one who narrates their day. You know the type. They announce when their coffee is too hot. They read their own emails out loud. They will absolutely stand up in the middle of a Tuesday and say, "Why am I getting texts about cats?"
That reaction is the entire prank. Pick a quiet coworker who silences their phone and you've bought a subscription nobody sees.
A few other good candidates:
- The coworker who has pranked you before (this is payback, and payback is fair).
- The one with a cat photo as their desktop wallpaper (they will secretly love it).
- The one who says "I have a question" and then asks four.
How many cat facts a day is the right dose?
One to three a day is the sweet spot for a coworker. Plans start at $2.99 a month for one fact a day, and that single daily text is often funnier than a flood. It shows up, they frown, they ask around, nobody confesses. Then it happens again tomorrow.
Three a day works for someone who deserves a slightly louder week. Fifteen a day, the maximum, is reserved for one person: the guy who microwaves fish in the shared kitchen. He knows what he did.
When should the first fact arrive?
Timing turns a decent prank into a great one. Our favorites:
- Monday morning. Their phone buzzes before the first meeting. Cat fact. Week ruined, in the best way.
- Right before their big presentation. They glance at their phone for confidence and learn how many hours a day cats sleep instead.
- The day they come back from vacation. They are already drowning in email. Now there is a cat.
One rule: never pick a genuinely stressful moment. A funny buzz before a routine presentation is a joke. A buzz during a difficult meeting with a client is just mean.
What happens when the whole team is in on it?
This is where the prank gets legendary. Sign up one coworker, tell everyone else, and watch the group chat.
The target will post a screenshot: "Anyone else getting these?" The correct answer from every single teammate is "No, weird." Someone should ask a follow-up question about the fact itself. Someone else should express mild concern. Keep a straight face for a week and the reveal will be talked about at the holiday party.
Two guidelines for the group version: keep it in the group chat, not the company Slack, and agree in advance on who reveals it and when. A prank with an ending is a joke. A prank with no ending is a grudge.
What are the office-safe rules?
Read these before you enter a number. They are short and they are not optional.
- Never a boss you report to. Power dynamics make it weird. Prank sideways or not at all.
- Never anyone on a performance improvement plan. They have enough going on.
- Never during bereavement, a health scare, or a rough personal stretch. Wait. Cats will still exist next month.
- Always someone who pranks back. If they have never once pulled a joke on you, this is not your person.
- Never someone who already told you to stop. Once is a prank. Twice is a pattern.
If your coworker fails any of these, pick a friend outside of work instead. We have a whole list of funny ways to annoy your friends that stay on the right side of harmless.
How do you set it up?
Go to the signup form, enter your coworker's number, choose one to three facts a day, and confirm. It takes about 30 seconds and you can do it from the parking lot before you walk in.
Then act completely normal. That part is on you.