My fully functional ThinkPad plays a tune on every boot. The tune means "BIOS Password Required". Then, two tones rising mean, "Password Accepted". I had to ex

My fully functional ThinkPad plays a tune on every boot. The tune means "BIOS Password Required". Then, two tones rising mean, "Password Accepted". I had to explain it to my mother the other week over the phone. A few weeks ago, I was boarding a bus with a brand-new mobile fare; I scanned the QR and it turned green and beeped, I guess twice or something, and the operator summons me back and he goes, "it has to beep once", so I shrugged, scanned again, got 3 beeps and a green light, message says, "already scanned" and I asked the operator "what does that mean?" and he didn't know. Come in, C-3PO, where could he be?