Fireworks Grenade

Sorry, I didn't bother with any pictures, but its pretty easy to explain how this works.

Step 1: Things You Need

Get this stuff -
1. Fireworks
2. An empty container
3. A couple wires
4. A windup clock
5 A light switch
6. 9v battery
7. Flashlight bulb

Step 2: Making the Timer

That'd be stupid if the fireworks went off right away after you flipped the switch, so you can make it in a timer. On the second hand, get a wire connecting to one end of the 9v battery. The other wire on the minute hand connecting to the other end with the bulb on it.

Step 3: Testing the Bulb

Tape something metal like a piece of foil on the minute hand of the clock so when the second hand comes it touches the metal completing the circuit. Break the bulb, and move the wires together so it will still turn on. Set the clock back about 5 seconds, test it a few times by turning the clock on, when the hands touch the bulb should turn on. Then bring it back to five seconds before the minute hand.

Step 4: Add the Fireworks

add the fireworks into the container so that when the clock turns on, five seconds later the bulb will turn on igniting the fireworks. If this was a real grenade there would be real explosives in there, but don't do that it could explode stuff. Disconnect two wires from touching each other. Turn the clock on, it wont go unless the wires are touching, so put them both in the switch so they'll touch when the switch is activated.