11. Needle in a Timestack by Robert Silverberg - This is a collection of 10 short stories, all classic sci-fi. Every story has a twist somewhere, usually ones that made me laugh out loud at the protagonist's expense. Silverberg is very good at getting you into the story quickly without bogging down in details. Some of the stories were a bit more gruesome than I expected (not full of gory details, just lots of folks meeting an untimely end), but even these had their share of dark humor.