One that caught my fancy (and I've told this one elsewhere in the forums) is a story of a WWI English fighter pilot who is running away from a dogfight in 1916, flies into a cloud to hide and comes out of it (we learn) in 1960 over an American base in the same place in England. He comes to a landing, his little biplane amidst modern jet traffic of the time, taxis to a stop among bewildered US airmen and delivers himself of classic English understatement:

"I had no idea you Yanks were so advanced!"