The Joker is playing the amnesia card.

Accused mass murderer James Holmes told jailhouse workers that he remains stumped about what landed him in a Colorado lockup, a jail staffer told the Daily News.

“He claims he doesn’t know why he’s in jail,” the worker said Thursday. “He asked, ‘Why am I here?’”

Holmes, 24, who is charged with shooting a dozen people to death and wounding 58 more at a screening of the new Batman movie, was also complaining of a stomach ache caused by lousy jail food after his sixth day at the Arapahoe County Detention Center, the worker said.

“He’s claiming his belly hurts him,” the worker said. “He complained once that he didn’t like the food . . . The guy killed 12 people, and he’s upset that he’s not getting a four-star meal?”

The former California honor student picks at his meals on some days, and doesn’t eat at all on others. A typical breakfast would include sausage and grits, while lunch could mean a ham sandwich.