If you're an iPhone user sending an iMessage to another Apple device, you might know of a little trick to see when you're about to get a response back.
The three little dots will blink in succession, or dance, as Jason Cipriani from CNET put it. Some might spend seconds or minutes while the dots dance waiting for an incoming message.
How the iMessage prank works. (Image source: MiscellaneousMischief.com)
But there's a trick you can play on your other iPhone-owning friends, having them stare at their phones in anticipation for, well, ever.
Here's how Cipriani explained it:
What you'll need to do in order to pull off the prank is visit this page on the Miscellaneous Mischief Web site using your iPhone. Save the GIF displayed under Step 1 to your iPhone's Camera Roll by placing your finger on the image until the prompt to save is displayed. Don't worry if the picture isn't moving when you view it in your Camera Roll, it will become animated as soon as you tap Send in iMessage.
Once you have that GIF saved to your iPhone, you can copy and paste it into any iMessage conversation and it will give the impression to the recipient that you're typing. And typing. And typing. With no end in sight.
The GIF on MiscellaneousMischief.com says it will "drive your friends crazy."