Don't try this at home

Wednesday at story hour at the library. Tried to make a boat using a small water bottle, some vinegar and some soda wrapped in a paper napkin. Put small pin hole in lid of bottle; put vinegar in bottle, put some soda on a paper napkin and wrap up tightly so it fits in the bottle; quickly put the cap on and put bottle in small wading pool filled with water. Reaction--bubbles released make bottle move. Our reaction--next to nothing. Then try not using as much paper napkin, works better but still try something else like putting more vinegar and less napkin. Results--lid pops off spraying surrounding kids with vinegar. Some laugh, others wipe their eyes and wonder what the heck they are doing there! Next--librarian and helper clean up kids, floor and surrounding area. Have kids use cups to get water out of wading pool so can be dumped out. Take out plastic cloths from floor to dry. Helper goes home to mow lawn. Librarian stuck there until 7 p.m.