extremely startling, distressing, or offensive <shocking news>
church key - Started out as slang for bottle opener in the early 1950s and was considered mildly shocking, even sacrilegious.
flagrant, blatant - Flagrant implies shocking and reprehensible, while blatant is obvious, contrived, and usually obnoxious; flagrant is a stronger term than blatant.
forbysen, bysen - Forbysen is an "example or parable"; bysen is a "shocking thing."
tingle - From Middle English, possibly a variant of tinkle, its original meaning was "response to a loud noise" and "response to hearing something shocking."