Holding a remote car key next to your head increases its range because the water in your brain acts as an amplifier.
Keyless entry remotes are great, but they don't always work how you want them to. One of the most common complaints is that they just don't reach far enough, and there's nothing more annoying when you can't remember where you parked. After all, what's the point of having a "remote" entry if you have to be right next to the car for it to work?
Surprisingly, the key to fixing this is actually in your head. If you touch the remote to your head while pressing the button, you can unlock your car from a further distance. For even better results, hold it under your chin and open your mouth.