They were tabloid fodder back in the aughts, but a new memoir by Kevin Federline has revived the drama between him and ex-wife Britney Spears. Coverage: 
 -  The book, basics: Federline has written You Thought You Knew, which is out next week. Federline, 47, and Spears, 43, married in 2004 and divorced in 2007, but not before having two sons, Sean Preston, now 20, and Jayden James, 19, per NBC News.
-  A knife? Federline tells the New York Times he hasn't spoken to Spears in years, but he recounts anecdotes from his sons in the book about her, including this from their teen years. "They would awaken sometimes at night to find her standing silently in the doorway, watching them sleep—'Oh, you're awake?'—with a knife in her hand," he writes. "Then she'd turn around and pad off without explanation."