Imagine: it's morning, and suddenly a strange grinding noise comes from the next room. Is it a malfunctioning office device or a precursor to a pick-me-up? Our brains sometimes confuse these noises, but the difference is colossal. The Epson L3150 inkjet printer makes a sharp cracking noise when a paper jams. The HP LaserJet Pro M15w laser printer may emit a low hum, similar to a grinding mechanism, when the CF244A toner cartridge runs low. When turned on, the De'Longhi Magnifica S espresso machine activates a 15-bar pump, creating a steady humming sound. Then, the boiler, heating to 95°C for espresso, produces the characteristic hiss of steam and water. The old Siemens EQ.5, when pressurizing for cappuccino, can sound like a chewed sheet of paper in an HP OfficeJet Pro 8022. However, printer sounds are usually sharp and irregular, while coffee sounds are smoother, more hydraulic, and predictable. Next time you hear a mysterious hum before your first coffee, listen more closely. Is it 2:00 PM and your Canon i-SENSYS MF445dw has jammed, or is it 7:30 AM and your beloved Melitta Caffeo Solo is getting ready to go?