This happened at a new Perth (west australia) BP service station back in 2004.
I'd just started with the company and was doing night shifts. That means start at 11pm, finish at 7am. Understand, you couldn't do this job tired, and I always prefer sleeping during the day anyway, so this was a great job for me.
A few days after starting, we began to have issues with fridges being turned off, stuff falling off shelves, etc. Nothing obvious that couldn't be blamed on inattention but at the same time it would have been odd for several people to get the same thing wrong.
One night I'd just finished restocking the chips (they had a barrier in front to prevent them falling out) when I turned around to see the whole shelf on the floor. Odd, but it's a new store with new stuff. Maybe the shelf fell off, right? Put it back, 5 minutes later, same thing.
So, readjusted the shelf again, now convinced it's dodgy equipment, and went to stock the walk-in fridge. That goes fine. As I leave the fridge, I turn the cold back on at the wall. Note - it's not a flip switch, it's one of those ones you turn left for off, right for on. It's a physical effort to turn. Turn it on, walk away - hear a click. Look back, fridge is off again. Rinse, repeat.
Eventually, the fridge stays on and I head to the desk in a temper ready to write a complaint to the boss about dodgy gear. Note - even now, I still believed it was equipment failure, not anything else! Walk past fridge doors and run my hand along to make sure they're closed - as I reach the end and turn to check all is well, every single door pops open.
Only now do I start to think "Ok, this is weird."
Over the next few shifts, more stuff happens. Eventually I start comparing notes with other staff and find out things are happening to them as well. But it's not until we're open for around 2 months that one night, after another fridge incident and bread on the floor from a perfectly flat display table, that I look around the store and say "Harvey! Enough already! I have work to do."
That was it. From that night, it's Harvey. Stuff happens? Harvey. Everyone adopted it, whether they believed it or not. The best bits were that the boss asked me about it one morning. I explained that weird stuff happened and we'd named it. She didn't believe it happened.
A few seconds later, every pump on the forecourt beeped to be turned on - with no cars in sight. I simply turned around and said "believe me now?" You've never seen anyone so stunned.
It became a running gag in the company - "Oh yes, Fliss has her own poltergeist. He follows her around." And he did, from station to station. But he was never scary. I always saw him as a little aboriginal boy, about 10, who was probably very lonely. Then we came along and he wanted to play a joke or two and we gave him a name.