Connolly's Razor
A simple problem requires multiple complicated solutions to be discussed at length. This usually takes place while people are saying their goodbyes in an inconvenient location.
"It was nice to see you, goodbye. Actually... as per Connolly's Razor, let's go over the Christmas plans in detail while we stand in this doorway as I don't think what we agreed is suitable for my babysitter's gerbil"