[lj3]

I once worked on a retail time management game. The doors of your store would open and then close when the customers came in. After a while, the doors would just start swinging open and closed all the time, like the store was being visited by a vengeful ghost. We never did figure out what caused that.

This next bug (in the same game) we purposefully left in and it became an easter egg. A big part of the game was being able to customize your store with different retail stands and tables to put your merchandise on. If you edited your store layout while customers were in the store, you could trap them. The path finding code we wrote for the customers required a valid point of entry and a valid point of exit to the store. As soon as you trapped the customer, the lack of valid path to an exit had an unusual effect on the character animation. The character movement and animation speed would increase up to 2x, which made the customer look like it was freaking out. It also negatively effected the customer "happiness" state. A store's reputation score was based on the average customer happiness level over a particular time period. A trapped customer could absolutely destroy that score. I've seen it drop from 2000+ to 0 in seconds. As with the other bug, we never did figure out why this was happening.