A hole has to penetrate completely.

If you can follow a hole to a dead end, it's not a hole, it's an indentation.

The old joke is there's no topological difference between a donut and a coffee mug.

But tear ducts would be the same

By that restriction we’re merely 4 hole donuts

Tear ducts actually connect into the sinus cavity. Under normal circumstances, the sinus tissues make a sort of tesla valve that prevents flow in the wrong direction, but various things that mess with the nasal mucosa can let you blow air or water out of the corner of your eyes.

The human body has more in common with the 737 Max than anyone would like to admit.

Eww

It's a feeling I knew all too well before my sinus surgery.

It's also how some people do that trick of squirting milk out of their eyes.

Or in the old times get some blood in there to scam some religious people!