I now carry *two* multi-tools in my bag at all times. The Leatherman has been joined by Think Geek's Micro Spy Remote. You point the teeny little remote at any TV you want to control and hold down the mute button -- as soon as your target TV mutes, you let up on the button. Now the channel, volume, mute, input and power buttons are all tuned to control the TV you've hijacked.
Tired of watching soccer at your favorite pub? Switch it to Rock of Love Mystery Bus.