Unlock: Complete Three's Company, Use Trevor
Bonus Requirements:
Pre-Emptive Strike – Obliterate 4 clown vans before the clowns spawn out
Greatest Dancer – Kill 6 clowns while you are dancing.
Head to the marker. Use the auto-shotgun here to hit clowns popping out left and right. Waste them quickly keep moving. Shoot the engines to destroy clown vans fast.