The catapult didn't work so well. Nor did driving over the border fence with a makeshift ramp. Now Mexican drug smugglers have resorted to cannons, authorities say. Smugglers used a pneumatic cannon to shoot containers of pot over the border into an Arizona field, reports the Yuma Sun. It worked, except a citizen spotted the cans and alerted authorities before smugglers on the US side could retrieve them. The 33 cans had about $42,000 worth of marijuana inside. The would-be smugglers and their cannon remain at large.