There are two forms of apple bobbing at Halloween; both involve trying to get hold of an apple using only your teeth.
In one, the apples are floating in a tub of water; in the other, the apples are hanging from a branch suspended from the ceiling.
I invented a Covid safe version (people wearing masks just boop the candy with their mask) using individually wrapped candy.
Here is a video of me demonstrating the device:
And here’s a video I made a couple of years ago about the history of Samhain and Halloween.:
And a shorter video about Halloween customs:
Dowsing for Divinity 