Mice can fit through tiny holes. An old rule says that if a pencil can get through - a mouse will get through. Some mice even fly. I once had a bat clinging on my good old CAT cable. So even leaving windows open at night might affect bandwidth...

Another classic is the "Frog on Keyboard error". Software developers have to be prepared for everything...

https://thedailywtf.com/articles/Classic-WTF-Cursed-and-ReCu...