Ice sculpture melting!
This is too good..
I work alone now, but when I worked at a local restaurant, we had a kitchen upstairs and a bakery/prep station downstairs, with all the food, refrigerators and freezer. So a lot of supplies were called down on the intercom, without a chance to question.
A cup of fennel seeds, split, on the rail. I'd watch preppers bumping into each other, grabbing paring knifes.
Clam/oyster glue.. Sent to store because we were always out. Make sure to get the "tasteless" not the "lobster fresh" glue.
A lot of the pranks were called down.. People afraid to go upstairs and say they couldn't find it. They would always come to me, shaking, holding their inventory list for upstairs. Filled with the weirdest stuff. Id snatch the list from them, saying I'd take care of it, while they whipped my cream by hand.
We had one guy running up and down the stairs for one thing at a time. One carrot, a quart of 1/2 and 1/2 ect. He got into a huge hurry that he was taking 2 to 3 stairs at a time. He slipped half way up and came tumbling back down. He jumped up, grabbed whatever he dropped an ran back up the stairs screaming "I'm good, it's cool". Determination.