Imagine if you were invisible and could come and go as you pleased, with nobody able to see you. Cool, right? Well, not really. H.G. Wells' "The Invisible Man" has the sci-fi master exploring what would happen if a person took an invisibility elixir, and discovered too late that invisibility has some definite downsides. It's possibly Wells' funniest novel, but it also has some wonderfully chilling moments. 
 A strange man arrives at a hotel in Iping, wrapped up in goggles, bandages, scarves, and heavy clothes. He spends most of his time hidden away in his room, doing odd scientific experiments, and avoiding contact with other people -- while still keeping everything except his nose hidden. Meanwhile, the local vicar and his wife are robbed by a mysterious thief... who is completely invisible. 
 Well, you can guess what's up with the stranger -- he's an invisible man, and after a blowup with his landlady he reveals his true.... um, lack of appearance to the entire town. After a series of disastrous encounters, the Invisible Man encounters Dr. Kemp, an old friend to whom he reveals how he became invisible, and what he's done since then... as well as his malevolent plans for the future. 
 H.G. Wells isn't really known for being a funny writer, but the first part of "The Invisible Man" is actually mildly hilarious. He writes the first third or so of the book in a fairly light, humorous style, and there are some fun scenes speckled through the story, like a homeless man dealing with the Invisible Man ("Not a bit of you visible--except-- You 'aven't been eatin' bread and cheese?"). 
 But things get much darker after Mr. Kemp enters the scene, and we find out that the Invisible Man is... well, kind of malevolent and crazy. Very crazy. 
 And as the plot grows darker and grimmer, Wells also inserts a clever (if far-fetched even by Victorian standards) explanation for how a person could become invisible, using a mix of science and fantasy. The plot hurtles through wild chase scenes and the occasional riot, and some moments of bleak tension ("When dawn came to mingle its pallor with the lamp-light and cigar smoke of the dining-room, Kemp was still pacing...") 
 The Invisible Man himself (aka Griffin) is a pretty mysterious character for most of the story, since all we know about him is that he's invisible.... and also kind of a jerk. I mean, the guy constantly flies off the handle and even robs a nice little old vicar. And the more we find out about him, the more malignant and insane he turns out to be. 
 Even if you had a way to become invisible, "The Invisible Man" would be a pretty effective way of dissuading people from using it. A deserving classic.