system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do flies land on the ceiling?

I have been thinking about this for a while. I am pretty sure they can't fly sideways so I honestly hope that they will do a backflip right before landing.
gpt
I had no clue.  Looked it up.  They fly normally, lift their front legs over their head and grab the ceiling, then flip the rest of the body up.  Then they have sticky glue secreted on their feet to stick.  Study showed the walk using three legs so they don't have to work so hard to dislodge all of their feet when walking. The More You Know. 🌈