I am always looking for fun things to do on this game and/or CLoD and wanted to get a sense of what others do to challenge themselves for fun. This could be a very specific build (like the all charms with T6 gear), a character limitation challenge (no uniques allowed, no skills higher than level req 6, etc) or just a weird in game goal you've set out to complete.
As an example of one such weird goal, I decided to set out on a journey in vanilla LoD to see how long it would take me to clear every monster, from every section (caves, dungeons, etc), of every single difficulty from Act 1 - Act 5.
Through the help of a Maphack with monster reveal, and the generous help of 1-5 other players at varying times, the entire endeavor took around 9.5 hours start to finish. We started with hell, which took just shy of 5 hours, and worked our way down to normal.
Im looking for weird things to do or try, so what have you got in mind?