When a butterfly unexpectedly flutters by and surprises Elmo, it sets off a chain reaction of funny accidents.
- ISBN10 0679987002
- ISBN13 9780679987000
- Publish Date 20 July 1999 (first published 3 November 1998)
- Publish Status Active
- Publish Country US
- Imprint Random House Books for Young Readers
- Format Hardcover (Library Binding)
- Language English