Marijuana has not been the topic of a mainstream sitcom in quite some time. Christine and Barb come across a 'roach' in the lost and found box and it becomes a will-they/won't- they situation as Christine struggles with her inability to follow through on anything she starts (Barb doesn't seem to have any such 'struggles' in this case).
The girls plan a 'pot party' and slowly but surely, Matthew, Richard and the guy that Christine went out with but can't remember his name (Tom - played by former Kid in the Hall, Dave Foley) all get involved to one degree or another.
Everybody turns to Matthew for his 'expertise and stash', but he is a declared non-user - to everyone's surprise. One of the main strings throughout this show is Christine's hysterical use of 70's drug lingo that she has picked up over the years from watching reruns of Starsky and Hutch, etc.
As usual, Matthew and Barb have numerous great lines, and Christine and Tom resolve some old issues that may hint to her next relationship (I guess if Dave Foley passes some muster that the producers and network have pre-determined). All things considered, another great episode of this underrated show that continues to draw well on a very competitive Monday night schedule.