find / -user kim -print 2>&1 | less

or

find / -user kim -print > messed_up_files.txt

In the first one, files and errors will be printed to the screen and
paged with the "less" command, in the later one, the errors will be
printed to the terminal and the results will go into the file.

pretty amazing how many files got changed in 2-3 seconds
Almost back to normal now.

When I worked as a sysadmin (retired now), we would occasionally take
a machine that was due to be decommissioned or reimaged, and do an rm
-rf on the root filesystem, to see how long the machine took to become
unusable. I guess we were easily amused. :-)

Changing the default runlevel of a machine "reboot" was more fun. It
was entertaining to watch a new admin try to figure out what the
problem was and how to fix it. There were other evil tricks, but I'll
leave them to the imagination...