The song Girls and Boys by Blur features lyrics that are complex from a Set Theory point of view. This Venn diagram t shirt clears things up nicely.
This garment was conceived by the founders of Maths Gear when they were investigating the difference between Venn and Euler diagrams. The results of those investigations were performed as a stand up routine around the UK in a live science comedy show called Festival Of The Spoken Nerd. You can get the whole "Just For Graphs" show on DVD and download here.
Price = p161 pence = £9.47