In 1964 10 Sqn Victors zapped the top of the Officers Mess garages with XV IS BUMS. They were ordered to remove the offensive white lettering. The black over paint was still visible 30 years later.

A naughty schoolboy painted HM Prison on the roof of my school in the 70s. The cleaned tiles still clearly spelled the same when I started flying and went to have a look 10 years later..

Two that I remember involved Kinloss Nimrods. Firstly in the early 70s, more tail art than zap, the Fincastle Trophy winner had,on it's tail, John Bull throttling a Kiwi with one hand, crushing a Maple Leaf with the other and had his foot on the neck of a Kangaroo. The second was, I think XV260, in Gibraltar during a NATO exercise, when it was decorated in 120 sqn colours being zapped, or carefully adapted, by Trembler groundcrew so that it became a 111 sqn aircraft. (CXX into CXI)