For the last few weeks, Dave and Karen have been dating and getting fairly serious (as first seen in Heavy Meddle). But when they visit Tim and Jill, Dave takes Tim aside and asks him to say that they had lunch together the day before. Why? Because Dave doesn’t feel the same level of commitment as Karen, and has been seeing someone else on the side. This puts Tim in an awkward position over whether or not to tell Jill, and by proxy Karen, or to stay true to his friendship with Dave, and play along. Before long, Jill discovers Tim’s secret, and she turns cold toward Dave, who blames Tim for not keeping up the facade.
Meanwhile, on Tool Time, Al is challenged to a blindfolded wood sniffing contest, and the Taylor boys continue their turf war against some neighborhood kids.