Some very enterprising Mexicans—if we had to guess, probably big Road Runner fans—found a whole new way to smuggle drugs into the U.S.

According to CNN, U.S. border patrol agents discovered a makeshift catapult mounted on to a fence near Tuscon, Arizona. The device was reportedly used to launch large amounts of marijuana into the country from Mexico. Authorities said they made the discovery Feb. 10, when they approached a small group of people near the contraption. Though the individuals immediately fled the scene, agents later found 47 pounds of packaged marijuana in the area.  

Agents then contacted Mexican authorities, who seized the catapult after U.S. agents dismantled it. The device appeared to be constructed of rope, square tubing, and a heavy spring.

Though this method may have been effective, it was far from the most creative way of moving weight between countries. Earlier this year, U.S. Customs and Border Protection officers intercepted a shipment of weed hidden in small pods disguised as limes. In 2016, agents discovered 2,486 packages of marijuana stuffed inside coconuts that were to be delivered in the U.S. And, months prior, authorities also came across nearly half a million dollars worth of weed packed into fake carrots