Checked on my batch of hard cider I made Wednesday, and it's bubbling away nicely in a Better Bottle.
Found myself watching the yeast at work, swirling around like a snowglobe; a lava lamp for adults.
Took me back to when I was a newbie brewer and fermented all of my batches in glass carboys, watching the yeast hard at work during primary.
Still cool, all these years later.