While most probably think laser is simply a word, it's an acronym: laser actually stands for "light amplification by stimulated emission of radiation." Taser, on the other hand, stands for "Thomas A. Swift's Electric Rifle." The electro-shock weapon was actually created by a number of men, including John H. Cover, who named the weapon after Tom Swift, a fictional character he loved as a boy, according to Dictionary.com's blog.
There are plenty of surprising acronyms out there: Scuba divers are probably thrilled to be using a "self-contained underwater breathing apparatus," while anyone caught in a snafu is probably not so thrilled about "situation normal all f**d up."