If you’re looking for ways to completely mess with someone, here are a few for you to try out:

1. Ignore a person who seems like they’re about to talk to you. When they address you, jump as if startled and scream, “Who was that?!” Be sure to stare through them as if they aren’t there. As they speak, say things like, “Hello? Who goes there!” and act all scared as if an invisible person is talking to you. Eventually, mutter something like, “Must be imagining things,” and go back to whatever you were doing.

2. Get a rubber snake. Find a public place where you can sit for hours and hours. Sit there catatonic with the snake hanging out of your mouth. Don’t respond when someone talks to you or approaches you unless they’re really persistent, at which point stare at them sadly.

3. When someone boasts about some physical feat they can do, respond with, “Well, I can tie my shoes all by myself!” This works especially well if they’re low-key threatening you, and they’ll often wander off confused.

4. When someone leaves the dinner table for a bit, rearrange items on their plate, or introduce something that wasn’t there previously. They may stop a bit upon returning to wonder what’s different, then likely go on eating.

5. When someone leaves the dinner table for a bit, hide their plate somewhere. When they come back, tell them they already ate it. Have everyone else insist that they ate it, asking them, “Don’t you remember?” and add realistic embellishments on what happened until they start to believe you.

6. Show someone this post. All of it.

7. Walk up to a coworker and remind them about the agenda they need to prepare for the next board meeting. Ask them if you can count on them. As soon as they ask you what’s going on, stare at them accusingly. Then sigh in exasperation and say, “Never mind. I should’ve known you’d forget.” Walk away. They might think you’re crazy, but they may still feel a little worried about disappointing you.

8. Keep a plastic bag (such as an old bread bag) in your pocket. When you’re alone in a room with another person, inflate it and pop it while they’re not looking. Quickly hide the remains. When they look at you, act as if nothing happened. Wait a little while for the other person to forget about it. Repeat as long as the bag will last.

9. In the course of a conversation, give responses that aren’t relevant to what the person says, but which you’d still expect to hear in a normal conversation. In other words, act as if you’re having a totally different conversation from the one the other person is trying to carry on.

10. Hide something a family member or roommate uses occasionally, but not frequently. The next time they need it and start looking for it, ask them what they’re looking for. When they tell you, tell them you didn’t know they had one and that you’ve never seen it. Get others in on the act. Insist that this thing they are looking for never existed.

11. Ask someone, “Are you ever in a place and think you might have dreamed it before?” Weeks later, in the same circumstances and while wearing the same outfit, ask them that question again.

12. Gradually shift your accent during a conversation.

13. When someone is counting out loud, count along with them. After a little bit, start throwing in numbers slightly out of sequence. For instance, if you’re going, “Nine, ten, eleven,” throw in “Fourteen, fifteen…” The idea is to be just a little bit off. That way, you don’t outright make them lose count—you throw them off, possibly without them noticing. When you’re done counting, ask them to count again and count along with them, this time in proper order.

16. Set your phone’s text ringtone so it’s the same as someone else’s. Then text yourself at various times during the day/night when they’re around, but not frequently enough to rouse suspicion. Don’t answer your phone in their presence when someone else texts you. Don’t respond in any way to your own incoming texts. They’ll check their phone and find they have no new messages. After some time, they will start to wonder if they’re hearing things.

17. Show someone this post. Insist that there are only fifteen items.

Did these work for you? What happened as a result? Let me know in the comments! By the way, this post only has fifteen items. Really.