How to Get the Gong Show achievement in Left 4 Dead 2

This Left 4 Dead 2 achievement, is easy to get after you've won the game in Dark Carnival at spawn area 4. You must have an adrenaline shot and a melee weapon. You must use both to hit the gong in order to ulock the achievement. It's easy to get and will add 15 gamer points to your score. Good luck and enjoy!