My son is not a USB device

I do a lot of writing with my infant son on my lap.

Yesterday he was chewing on the cord that connects my phone to the laptop. Unbeknownst to me, he eventually worked his way up to the end of the cord and placed the connecter in his mouth.

I immediately received a warning message on the bottom right of my screen.

Here is a closer view of the warning.

While my son is not a USB device, I give my laptop credit for realizing that whatever was interacting with the cord was not normal.