Paul Rudd got extremely close to Michael Douglas when the two filmed Ant-Man last year . . . almost too close. During an appearance on The Tonight Show on Monday, Paul told host Jimmy Fallon that on Michael's last day on set, he decided that he was going to flash the legendary actor, Basic Instinct style. "I'm wearing a t-shirt and jeans, so I unzip my pants and I get it over and out. I'm like, 'This is going to be great!'" Paul revealed. "So I had to pull my shirt down so I wasn't exposed. Then I figured I'm going to sit down and when the scene starts and I'm going to lift my shirt up and just be there like this. The one thing I didn't take into account is that when I sat down, the waistband of my boxers was just going to push it up and back in. So, I knew it. You couldn't see anything, so I'm trying to pull my shirt down, trying to get it out, and he's doing his lines, giving you nothing. I should have just stopped but I didn't and it looked like I was basically pleasuring myself to Michael Douglas giving a monologue." Watch Paul tell the hilarious story above, then check out his stomach-turning game of "Drinko" with Jimmy.