Fredric Brown 
What Mad Universe 

BUG-EYED MONSTERS ON BROADWAYPulp SF magazine editor Keith Winton was answering a letter from a teenage fan when the first moon rocket fell back to Earth and blew him away.But where to? Greenville, New York, looked the same, but Bems (Bug-Eyed Monsters) just like the ones on the cover of Startling Stories walked the streets without attracting undue comment.And when he brought out a half-dollar coin in a drugstore, the cops wanted to shoot him on sight as an Arcturian spy.Wait a minute. Seven-foot purple moon-monsters? Earth at war with Arcturus? General Dwight D. Eisenhower in command of Venus Sector?What mad universe was this?One thing was for sure: Keith Winton had to find out fast – or he’d be good and dead, in this universe or any other.