Rory McIlroy tosses a fan's remote-controlled ball into the sea.

In golf's lengthy history, invaders have ranged from human streakers to deer and alligators to a remote-controlled ball.

Fans came to the 15th green at the BMW Championship to see Rory McIlroy sink a putt, but instead saw him desperately battling to keep a ball out.

McIlroy and Scott Stallings were nearing the finish of their third round when a remote-controlled ball drifted towards the flag.

The remote-guided ball had circled the hole many times when McIlroy swatted it away with an extended club. He then turned to face the pilot and blocked another attempt by the ball.

McIlroy sent the ball into the river protecting the green, much to the crowd's pleasure.
Cheers changed to boos as the interloper was escorted away by stewards.

Northern Ireland's McIlroy waits to putt on the 18th green Saturday. Getty ImagesStallings stated, "That's not what I anticipated on a Saturday afternoon."

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