McMahan, Greg: Balloons On The Mailbox ©1989 Greg McMahan, Odd! Productions Softcover, saddle-stitched, 5.5x8.5", 38 Pages

Image courtesy eBay seller Hypcat

Comments: Birthday Party Shows. Some entries I've seen say this book has 25 pages...

Contents (from book cover, numbers are not page numbers):

1 It's Showtime!
2 Grand Entrance
3 Warming Up
4 Rocky Raccoon
5 Setting Up

6 Running Gags
7 Pop-Away Wand
8 Professor Cheers Ideas
9 Oh No, Not Again
10 Call Before Midnight Tonight

11 Routines
12 Monkey Bar
13 Professor's Nightmare
14 Nothing Grinder Updated
15 Shooting a Rubber Chicken from a Cannon