Step 1: Ingredients

You will need;
-mentos
-coke cola

Equipment;
-string
-scissors

Step 2: Step 1

Take off the lid and place bottle with cola in aside... Next grab your string and mentos
Put a mento in the lid, and put a bit of sting in a cross shape across to secure

Step 3: Step 2

Sellotape the sting to the side so when the lid is upside down it doesn't fall and ruin your prank!:), put the lid back on and cut the visible string off.