If you want to anger your opponent, Libya is the way to go. Build an Iron Curtain device when time permits. Two minutes before the Iron Curtain is ready, build three Demolition trucks. Once the timer reaches zero for the Iron Curtain, move your trucks into position near your enemy's base. Select the Iron Curtain device on your trucks and send them in. Since your trucks have invincibility for a limited time, decide what buildings would best to destroy. You'll have your opponent asking for a rematch in no time.