The assignment was late, and instead of just admitting I'd lost track of time, I told my teacher the internet was down. Simple, unverifiable, classic excuse.
Meanwhile my entire family was actively using that exact same internet connection for other things the whole time. Streaming, calls, everything running perfectly fine, completely undermining my own story in real time in the next room.
She didn't ask for further proof. I did not offer any. The internet, notably, was fine the entire time, and the only thing actually down was my time management that day.