Step 1: Ingredients
You will need;
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.
Step 4: Step 3
Wait and watch your victim be complete taken by surprise a the mento drops and explodes!