Sometimes the actors (esp Arthur) say something incredibly funny that Doug cant stop laughing.Ive seen this a few time on KOQ like

In the mold episode,Carrie asks Doug and Arthur if everything is ok.Doug says "Everything fine and dandy" and looks at Arthur expecting him to say the same thing.Arthur says "Everything is fine"...Doug keeps looking at him but Arthurs says in a low voice "I gave u fine but i draw the line at dandy".In that scene you can clearly see doug unable to control his laugh.

In "Strike out" at the end when Doug and Deacon tell Arthur that the strike is over,Arthur gets upset and says something like "Its all about the money then,,,crawl for it" and keeps throwing money from his pocket onto Doug.Then almost immediately says "Actually I need those back".There we can see Doug keeping his head down and laughing.


Any more?

In an episode, when the mold comes into the basement- Doug and Carrie are in the hotel room and Dougs in his white robe and hes talkin like he feels like a polar bear; Doug jumps on the bed on top of Carrie- you can clearly see that Leah breaks character and is laughing at him so hard. Then after he gets up off the bed she gets back into character.... Just keep your eyes on Leah!!!!

In the beginning of "Alter Ego" Dougs reading a newspaper,Arthurs comes in from the basement and says "Douglas,Do you mind if i grab a more challenging section (of the newspaper)?"

Doug tries very hard to control his laughter when he hears Arthur say that.

One that came to mind is when Carrie finds out the line "Not only did you save my life brown eyes, but you made my life worth saving" was from a movie with Erik Estrada, and a monkey, she asks Doug "So tell me doug, when you say the like, are you thinking of me, or the monkey?" and Doug, fighting very hard to hold back his laughter, says "Almost always you." lol, hysterical

Also, when Kelly and Deacon get that awful portrait of doug and carrie, where doug has a huge forehead, and carrie has one enormous forearm and gigantic fingers. carrie complains about how ugly it is and that the eyes keep following her all over the room. So doug, again holding back laughter, says to carrie "why dont u just poke them out with ur gigantic fingers" sooo funny