Okay, this is one is a little crazy: these guys are playing Half-Life, with real guns. Is it necessary? No. Is it cool? Hell yeah! This is how they did it: they projected a first person shooter (FPS) game on a dry wall with 4 mounted accelerometers. Using the vibration measurements and graphical software, they were able to determine where exactly the bullet landed, and feed the coordinates to the host PC, where it converts it into a shot in the videogame. The key DAQ ingredient for this? Tightly synchronized, simultaneous 24-bit ADCs.