Of all the ways to prank someone, it is almost always the element of surprise when doing a routine thing that tends to have the best pay off. But one thing makes this all the more enjoyable: simplicity.

In this simple but possibly disturbing prank, we'll write a secret message at the bottom of a coffee mug, and wait patiently as the "victim" enjoys their morning cup of Jo- that is, of course, until the message reveals itself on the bottom of the mug or cup...

Let's get started!

Step 1: Choosing & Prepping the Mug or Cup

As a person who cannot start their day without a caffeinated beverage, your victim will usually have a favorite mug they use on the daily. This makes it ripe for picking and hacking. However, if your victim doesn't have a designated mug, you can write different memos on all of your mugs.

You can also use paper cups for this prank.

Step 2: Paper Cup Method

You can use any paper cup for this method, along with a sharpie permanent pen.

Simply think of a mischievous message that your victim would not like to see at the bottom of their cup, and write it on the inside bottom. Depending on how tall your cups are, writing legibly could prove to be challenging, just try to keep it clean.

Hand your victim the cup with an opaque drink inside (non-transparent, so no water or sprite.) And try not to giggle as you wait patiently for them to finish their beverage. muahahaha

Step 3: Mug Method

For this method, you will need glass paint and a mug. I used Martha Stewart Opaque glass paint in Habanero Red.

The tip for this brand made it perfect for writing out letters. This paint is food safe, but will need to be baked in order to cure completely, then will be permanent.

For baking: Allow project to air dry 1 hour, place in cool oven. Set temperature to 350 degrees F and bake for 30 minutes. Glass must heat gradually or it will shatter due to extreme temperature change. After 30 minutes, turn oven off. Let glass cool completely in oven.

You're done. Now wait for your victim to finish his/her coffee and look at the if-only-brief look of concern on their face as they read the hidden message.