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OAKLAND A'S center fielder Mark Kotsay watches as security personnel pursue Kali Wilson, who ran on the field at the McAfee Coliseum during a game last month.
OAKLAND — Two men — including one who wore an adult diaper during his disruptive dash — were charged Thursday with misdemeanors for running across the outfield during an A's game last month, authorities said.

Kali Wilson, 28, of Oakland and Michael T. Robinson, 24, of San Francisco were charged with violating a city ordinance prohibiting people from illegally entering a part of the stadium "before, during or after" an event such as a game, authorities said.

"We wanted to make the crowd laugh," Wilson said in a telephone interview Thursday. "All the fans got a huge chuckle out of it."

The duo was arrested about 2:15 p.m. May 15 after running on the outfield from the stands near the A's left-field bullpen.

The disruption halted the game for several minutes until the men were apprehended by security guards and A's right fielder Eric Byrnes, who pulled Robinson down as he tried to scale a fence.

The fourth-inning stunt was captured by stadium video cameras and by a fan who posted several pictures of it on the athleticsnation.com Web site. Wilson said he and friend Robinson — who was dressed in a black jersey and yellow shorts for the field trek — only decided to pull the prank after arriving at the A's game against the New York Yankees that afternoon.

"Once we got to the game, we thought about it and decided to do it there ... we decided to hit the field," Wilson said.

Wilson said he paid a man in a wheelchair $5 for an adult-sized diaper — he thinks it was a Depends — put it on and then charged across the field.

Wilson wore only the diaper and a pair of white running shoes during the stunt.

Police dispute Wilson's claim the prank was spontaneous. Investigators believe the pair had the prank planned long before their arrival at the stadium to create a DVD to sell on the Internet.

Wilson said he pulled the prank because he felt the crowd needed some comic relief following a previous day's incident where a Lafayette man threw beer on New York Yankees slugger Jason Giambi.

"We were going to turn anger into laughter," Wilson said.

Wilson, who runs his own film company and has produced a DVD called "Black Azz: Series I, Mr. Wilson," said he plans to include the pictures of the stunt on his next DVD.

Wilson said he launched the company after growing up in West Oakland around drugs, crime and violence. He said he used his personality to make himself and others laugh with "real-live behavior, deep in the'hood."

Wilson and Robinson are scheduled to be arraigned June 15 in Alameda County Superior Court. If convicted, they could face up to six months in jail and a $1,000 fine. Wilson, who was not aware Thursday of the penalty he faces, said he does not regret the stunt.

"The crowd laughed, and I'm happy that I did that," he said.