Make sure to have a taller shot glass. Put tequila in, then add the grenadine, then fill the rest of the shot glass with sprite. Take a short 2x4 piece of wood you might have around, and a napkin. Place the napkin over the shot glass so it doesnt fizz up. Take one end of the wood on your table with your left hand and raise it about six inches off the surface. Take the shot glass in your right hand. Slam the glass onto the wood and let the wood fall from your hand to the surface. Remove napkin and drink quick! Its great fun and tastes real good.