Based on the (really bad) sketch I did a few days ago:
Here's the line work, that is...without the colour. [link]
Because Michael Keaton played Beetlejuice and Batman, I didn't want Mr J and Beetlejuice to get along. Besides, conflict is funnier. So, in the first sketch, Mr J is squishing Beetlejuice but just with his arm. So, Beetlejuice now gets his revenge by sitting on Mr J while he's working.
I tried sketching Beetlejuice in a similar way to how he is shown in the cartoon series but it just didn't look right with my version of Mr J, so just made him up. He looks a bit like Spike from Cowboy Bebop! lol...Oh well! Hence the little doodle in the corner of me shouting at myself; 'Oi! Beetlejuice doesn't look like that!' I know he doesn't! Bla bla bla...