> One time I stored a bag of maple leaves in a garbage bag which I used for feeding my compost. I didn't need it much over winter, and in spring when I went to use it, dozens of bumblebees came out.

This is definitely really interesting from a biological perspective but also immensely terrifying as soon as I visualize it. I might literally scream if I saw a swarm of what would appear to my panicked brain to be zombie bumblebees in my garage, and I'd certainly run and hide.