Just like Casey at the bat, the mighty iPad has struck out—at Yankee Stadium no less.

Inside Apple's iPad: FCC Teardown Photos

"I'm at the game right now, watching them play the Red Sox. The security people told me it was not allowed and I was turned away at the gates," said baseball fan SpaceKatGal, in a post last week on an Internet forum maintained by the blog IGN.

"Why on earth would they have this policy? Terrorism concerns? I couldn't get an answer. I snuck it in under my jacket.. I bring it to Fenway all the time and they don't care," wrote the fan.

To Apple's chagrin, no doubt, the Yankees apparently consider the iPad to be just another laptop—and such devices are banned from the stadium, along with firearms, knives, video cameras, and beach balls.

In the case of computers, the team said it's a safety issue. Fans glued to, say, Facebook might be caught unawares by foul balls or flying bats headed in their direction.

Major League Baseball, according to reports, said it's up to individual teams whether to allow iPads into their playing grounds. The Yankees cross-town rivals, the Mets, allow iPads into Citi Field. Of course, the Mets' stadium also features a giant Apple that heads skyward every time the team hits a home run.

The Seattle Mariners are also reportedly iPad friendly, despite their location in the heart of Microsoft country. The California Angels, representative of Apple's home state, also allow the device.

Bans at sports venues appear to be having little impact on iPad sales. Apple recently said it has now sold more than one million iPads. The device first went on sale on March 31.