Another good way to freak out the pilots and FEs is to make them think they left everyone behind. My first squadron had the first two ISAR birds in VP. These planes had no aft radar and the aft radar rack in the galley was empty. Between that and the doppler well/HSC, we managed to hide the entire tube crew. When the FE came back after t/o to do his checks, the tube was empty. He freaked out and so did the rest of the flight station after the off duty pilot went back to check and told the PPC the FE wasn't making it up. I had a long cord headset to monitor the ICS/radios and started telling the pilots over our base frequency we all went to take last minute dumps at the fuel pit head and watch the airplane taxi away. Was he coming back for us? Then the XO jumped on (from the duty office, yes it was a well coordinated prank) and started screaming a the PPC about what an idiot he was. While the XO was screaming, we all snuck back to our seats and I walked up to the flight station and asked why all the commotion? It was great fun.