During a Taceval at RAF Scampton "Attention, attention! There will be a briefing for all crews in the Main Briefing Room at 10:00 hours".
The Ground Defence Commander, being a bit brighter, realised that this would be a very tempting target for the intruders who had been expected to infiltrate the station. A Word was obviously said, because a further tannoy message followed....
"Attention, attention. Ignore the last message; the briefing will now be 10 minutes later!"