I have a couple more good stories
A couple days ago a friend of mine accidently ran a normal file as a script, well that file had the word touch in it or something which caused a bunch of files to be created with a question mark at the end.
So he decideds to try and delete all the files by typing rm *?
(Delete all files that have at least one character)
A professor of mine while in grad school was cleaning up his directories and wanted to delete all the files in his directory that ended in .o
So he types rm -r *.o (so he thinks)
but he mistakingly was pressing the shift key still when he pressed the period so the command he typed was
rm -r *>o
(Delete all files and redirect the output to a file called o)