Soliciting answers to: What novels or short stories stand out in your memory as “weird”?

I’m soliciting answers to the following question:

What novels or short stories stand out in your memory as “weird”??

I’m doing this in order to put together a “mind meld” (inspired by http://www.sfsignal.com Mind Melds) blog and wiki article based on your answers to this question (inspired by this question posted on Facebook by my friend and fellow writer, Sherlonya).¬† Feel free to answer with as few or as many novels, short stories, etc as your patience and/or interest¬† dictate.¬† If you are inclined, I am also interested in the reasons behind your answer(s).