On 'How I Met Your Mother' (Mon., 8PM ET on CBS), some secrets about the past are revealed. In a flashback, we get to see that Barney (Neil Patrick Harris) seduced the parent of one of his friends. Specifically, he seduced Ted's (Josh Radnor's) mother. Barney reveals this fact to Ted in his typically sensitive style. "Your mom and I got to second base," he says.

Watch the video after the jump.On 'How I Met Your Mother' (Mon., 8PM ET on CBS), some secrets about the past are revealed. In a flashback, we get to see that Barney (Neil Patrick Harris) seduced the parent of one of his friends. Specifically, he seduced Ted's (Josh Radnor) mother. Barney reveals this fact to Ted in his typically sensitive style. "Your mom and I got to second base," he says.

Ted reacts to this news in the way that any normal person would. He screams and then smashes the wall. Yeah -- that seems about right.

But even better than that is this: Even while seducing Ted's mom, Barney still calls her by this name: "Ted's mom."