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Check a server is up. If it isn't mail me.
This version uses netcat to check a particular service.

dump 1KB of data from ram to file

Rename files with vim.
Opens a list of files in a text editor. Using Vim as your default editor allows you to use the power of regex substitution and visual block mode to batch rename files. Found in the renameutils package sudo apt-get install renameutils

phpinfo from the command line
show phpinfo(); from the command line

display a smiling smiley if the command succeeded and a sad smiley if the command failed
you could save the code between if and fi to a shell script named smiley.sh with the first argument as and then do a smiley.sh to see if the command succeeded. a bit needless but who cares ;)

Count down from 10
Countdown from 10 or whatever you want:)

Write comments to your history.
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

Compute the average number of KB per file for each dir
Use this to find identify if dirs mostly contain large or small files.

useless load
check your load with top... Start more of these jobs to get an multi-core cpu busy...

Capture all plaintext passwords


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