I once saw a very detailed Gantt chart in MS Project detailing 6 months worth of lies about various projects would deliver.

My colleague nudged me out of a stupor as I stared at the overhead projection. "Its Excel!" He whispered. "What are you on about?" I said. He was clearly mad. "The chart! He's done it in Excel". To my horror I began to see. This wasn't MS Project at all. It was subtle because the cells were so small they were almost no bigger than a pixel. I gasped and almost took the presentation off course.

It was like a mosaic. A feat. I've never seen anything like it since. Still baffles me how much effort he must have put in and the pain he must've felt every time that crappy plan inevitably moved to the right.