I'm making an executive decision to plan lessons rather than post a sunday short stack, so in lieu of links, enjoy Sarah Silverman's lovely message to her fella on The Jimmy Kimmel Show earlier this week.
"So it is with minds. Unless you keep them busy with some definite subject that will bridle and control them, they throw themselves in disorder hither and yon in the vague field of imagination... And there is no mad or idle fancy that they do not bring forth in the agitation." - Montaigne