What keyboard macros do you guys use when you have programmable function keys?

Also a funny little story that I just remembered. My brother used to have a key that would type his password cause he was THAT fucking lazy. He was writing an NPC for a private Ragnarok Online server that I was testing with a couple people. Apparently he had hit that function key in the middle of an announcement command.

So basically, everything went as planned, but then while announcing an event, it would announce his password to THE ENTIRE SERVER. Lucky for him, there were only three of us online at the time, and we told him as soon as it happened.