A few years ago at a MAJOR london airport one of the TWR ATCOs arranged for a friend out of a small airfield nearby to do an ILS approach, and i think a touch and go on XMAS day. He coerced a friend in APP to help him out. Typically just as the Cessna was over the threshold, the BAA duty operations manager decided to "drop by" the VCR for a chat and wish us all a merry xmas. He never said anything, but did look rather strangely at the A/C on APP. Lets just say everyone did their best to distract him.
Things got worse when the pilot returned and rang all his mates, who immediately jumped in their planes and called APP for the same!! Approach were quite busy that XMAS!!