I have a brother-in law who was interested in D&D so I told him that one night I would do a one shot for him, his wife(my wife's sister), my wife and my wife's brother. I started them in the Sunless citadel, fully expecting that all of the women would be bored and just do it as a favor to the one guy who was actually interested. Everybody loved it and wanted to start a campaign.
Very cool.
Expecting that it was a one shot I hadn't put much thought into it and I wanted to create more of a world, so I told them that we would finish the module and then restart. So in the last encounter at the tree with the Druid and his wand of entagle I killed them all.
Um, not cool. Why didn't you just run them through another adventure? Did you really think they'd be upset that you hadn't created an in-depth world?