"Improbable Times" by E. Mark Mitchell

A hilarious story that plays on the 'multi-worlds' theory of quantum physics (where every action creates a whole new universe). A lawyer suddenly finds a fish in his briefcase and decides to pay a visit to his friend who is a scientific genius but a klutz when it comes to common-sense. Of course, his friend turns out to be the cause of the fish and it is just the beginning of a cosmic disaster. But fixing it will require a lot of work along with help from an intelligence millions of years in the future. Plus, the lawyer will have to learn to live with a large, pink sofa.

• Read from Analog SF, June 2005