Lego, pastries, and a word for cosiness the English-speaking world spent about five years going on about.
Fun fact: The Danish flag has been in continuous use since 1219, making it the world's oldest state flag.
Some species fake other fireflies' glow patterns to lure in blokes and eat them, which is proper dark.
Fun fact: Some female fireflies mimic the flash patterns of other species to lure their males as prey.