“The two most common elements in the Universe are Hydrogen and Stupidity.” Harlan Ellison (born May 27, 1934), US author.
Although stated by Ellison in a non-fiction essay in the mid-1960s, this quote has been frequently misattributed to Frank Zappa. In Zappa's autobiography, The Real Frank Zappa Book (1989), on page 239, Zappa does make a similar comment: "Some scientists claim that hydrogen, because it is so plentiful, is the basic building block of the universe. I dispute that. I say there is more stupidity than hydrogen, and that is the basic building block of the universe."