Rum and Coke: A Case of Complements

During my Fundamentals of Microeconomics class I routinely used alcohol for almost every section of my lessons. Why? College students understand alcohol much better than they do wheat and butter. Almost every chapter can be adapted to include some reference to alcohol, its production, or its consumption.

A fellow Twitter economist (@Patelnomics) posted a nice graphic of complements. I'm not sure where the source originated, but I found it from his, so I'll give him proper credit. Without a doubt, this is a great example of stores bundling complementary goods to reduce the search costs of buyers.

What was your favorite example of complements as an economics student? What did your professors use that you found boring?