Efron was assigned to sit next to the Material Girl at the recent Conor McGregor fight they both attended, and he blushed hard when Kimmel asked him if anything happened between the two of them.
"Is it possible that she was trying to have sex with you?" Kimmel asked his guest. "Is it possible that Madonna maybe switched the signs so you could be seated together? Because Madonna is an irresistible person. When she sets her sights on someone, there's really no escaping."
"She's captivating in that way," Efron said. "I can't confirm nor deny that."
Kimmel even played video footage of the two at the fight, where Madonna could be seen tapping Efron on the arm to get his attention.
"I guess you can say she tapped me. She tapped this," Efron joked.
Efron also dished on her fervor for the fight, adding that "she was having the time of her life," and that she was "amazing" to hang out with.
"What do you mean by that?" a fascinated Kimmel asked, then got back to his original inquiry. "Did something go on between you and Madonna?"
Kimmel said that if Efron and Madonna were to ever actually hook up, the whole country would have to celebrate.
"We'd have to have a parade for her if that happened. And for you," Kimmel said. "We'd have to have two parades, one on each coast: the Zac parade and the Madonna parade. Two sex parades that would meet in like St. Louis, or something like that."