Demi Moore once dated Jon Cryer. That surprising revelation is just the tip of the iceberg of juicy bits in the new Jon Cryer tell-all memoir So That Happened.

The book, due out April 17, tells how Jon Cryer was sitting in on the auditions to find someone to replace Charlie Sheen on his show Two and a Half Men. There he met the man who was to eventually get that role: Ashton Kutcher. Cryer knew that Ashton was married to Demi Moore.

What Cryer wondered was whether Ashton knew that he had once dated Demi Moore.

“It was awkward in that I’m not sure she even told him that we dated,” Cryer says in the book. “In our first meeting, we’re trying to have that let’s-create-that-chemistry meeting and the whole time I’m looking at him, waiting for him to drop the bomb.”

In the end, things didn’t get weird.

“At the end he said, ‘She told me.’ He was cool about it.”

This must have been a welcome relief for Cryer, who by this point was used to things being very weird.

Jon Cryer relates several uncomfortable but entertaining tales about Charlie Sheen. One might wonder if Sheen would be angry about it. But Cryer says he got it cleared beforehand.

“I even asked him if I could print a bunch of his texts and he agreed. His only request was that I correct his grammar,” Cryer said.

One such story with texts is about when Charlie Sheen got arrested in late 2009.

“I had been enjoying Christmas Day of 2009 so much with my family around me that I somehow managed to stay away from all Internet-connected devices. It’s the holiday present that doesn’t announce itself, really. Then, of course, you give in, check a news site and read that your co-star ‘Carlos Irwin Estevez’ has been arrested in Aspen, Colo., for spousal battery [of third wife Brooke Mueller]. Alarmed and freaked out, I texted him:

Dude, my thoughts are with you. If you need to talk, give a call; if you’ve got bigger problems, call me when you get back.

Charlie texted back:

Thanks bro. Yikes — f— me, wut a bad day … I’m flying home tonite. I’ll try to call over the weekend. Shower rape was bad but the food was okay. Hair and makeup for mug shot got there too late.

He followed that with:

And I had same bail bondsman as Kobe. … No joke … 🙂