People who were fired on their first day at work/saw somebody get fired their first day at work: What happened that led to the firing?

I worked at a pet shop for two glorious days not knowing that I was the backup in case the boss' nephew was accepted into his preferred college program. He was not accepted so I got the boot to make room for him on the team.

The manager doubled my first/ only paycheque because she felt bad. I'm still bitter 17 years later