Frankly I’d be scared shitless to act alongside Jack Nicholson and that fear would probably make way for me messing something up. In the blooper reel from HOW DO YOU KNOW below, we get to see what happens when you screw up in front of Jack. He politely but very Jack-like tells you to get your ass out of his face.
Later we see Nicholson being perhaps more goofy than you’d expect and Paul Rudd just being a little bit insane (as we all love Paul Rudd for doing). Blooper reels are a simplistic thing to laugh at, not unlike a guy getting hit in the nuts with a football, but there’s an instant likeability to this particular clip (due in no large part to Rudd, who can practically do no wrong) that will hopefully carry over to the film itself. Check it out below.