With the benefit of hindsight I actually really regret doing this, but at the time I was a shithead that only thought of themself.
One summer a friend, who was the assistant manager, got me a job working at Game Stop. It was the third worst job I've ever had and I hated working there. My friend was running a scam in the store where he would take all the games in the drawers that didn't show up in inventory and exchange them for cash. Just the transactions I ran for him, he netted several hundred dollars.
What my friend did not realize though, was that there was a lag time between a game being traded in and it appearing in inventory so he actually had been turning in games that were in the system. The store manager became suspicious, ran inventory himself, and discovered several thousand dollars worth of missing games. During the course of his investigation he interviewed all of the employees and when it was my turn the only thing I said was that another employee that I didn't like personally because he was a mouth breathing know-it-all was the only one who brought a backpack to work everyday, he was fired several days later. A month after that I quit after the store was robbed at gunpoint for the third time in the three months I worked there.