Not the rubbish film- the actual thing with dungeon masters and 'role playing' and special dice that isn't games workshop.
It seems to be referenced in comedy a bit- the episodes of Community and the IT Crowd that featured it were very lol-worthy.

Do people still play this, or are they all forming World of Warcraft Clubs? Have any Dissers ever played it, and if so would they admit it?

Once I saw some LARPers having a swordfight opposite the Park Inn in Nottingham. Not seen them since..