You serve Coke and in few minutes after serving, the glass starts overflowing suddenly.
Step 1: Take some Mentos and keep it in the ice-tray with water to form Ice-Cubes with Mentos inside.
Step 2: Serve the drink with these magical Ice-Cubes.
Watch The Fun: As the ice melts, the Mentos will do the rest of the magic (around 5 minutes later :D ).
Love this idea!