Saitek (now logitech) sells flight simulator peripherals in the form of a throttle box and separate flight stick. They use two different USB cables and plugs instead of connecting one to the other, and they are technically two different devices. If you connect them to the same USB hub or to a USB system with not enough power, they will seem to work just fine, but will send a completely random button press or stick movement every so often. Changing ports will fix this.
Another logitech one: I have a g27 steering wheel/pedal set/shifter combo. The pedals plug into the wheel, which also connects to a power supply and USB cable to connect to the computer. If you plug the steering wheel into the power and DON'T plug in the USB cable, metal parts of the pedals "leak" current, and you can feel a painful sensation if you touch the metal with exposed skin.
Another logitech one: I have a g27 steering wheel/pedal set/shifter combo. The pedals plug into the wheel, which also connects to a power supply and USB cable to connect to the computer. If you plug the steering wheel into the power and DON'T plug in the USB cable, metal parts of the pedals "leak" current, and you can feel a painful sensation if you touch the metal with exposed skin.