Seductive Design for Web Sites
http://www.uie.com/articles/seductive_design/

User Interface Engineering
1998

Abstract:

Education has a concept called 'the teachable moment,' the point when a learner is ready to learn, willing to change, and can act. For web sites, the parallel is something we call 'the seducible moment.' This is the point at which designers can entice users off the path to their original goal with the lure of something else.