I remember discovering this as a boy scout of around 14 and when I presented it to our scout leader, the look he gave me suggested that he was trying to decide whether to call the police or the psychiatric services. I've kept these things to myself ever since.
Yes! the zeppelin bend is also my favorite knot. I probably don't use it as much as a bowline, but it comes in handy joining two lengths of rope, looks cool, and is always easy to untie no matter how much the knot has been loaded.
Besides the bowline my most used knot is probably the trucker hitch.
Carrick bend is another favorite of mine, but I prefer the zeppelin bend for real world usage.
It's used to tie the ends of two ropes together.
It's super easy to tie, super easy to untie (when you want to), and will not untie accidentally.
[1] - https://www.animatedknots.com/zeppelin-bend-knot