One sillier one I look back fondly on was an undersea themed email signature generator I wrote maybe 20 years ago or so. I think it was a Perl script connected

One sillier one I look back fondly on was an undersea themed email signature generator I wrote maybe 20 years ago or so. I think it was a Perl script connected to a named pipe or similar, so whenever my mutt client read it I got a new sig. It generated 4 lines of an ASCII art underwater scene, containing a randomised selection of different fish, sharks, boats, seaweed, crabs, rocks, shells, treasure chests, etc. There was a bunch of code to ensure no overlap, and more natural looking scenes. There were also certain things that only triggered on certain special days of the year (Christmas etc.), and others that only appeared in conversations with people I'd exchanged more than N emails with. Sadly it went away when my email client moved to be primarily web based.