Invisibleness

"Hey guys, watcha doin'?" Bill asked as he and Bob walked into Phineas and Ferb's backyard. "Get outta here." Phineas said. "Okay, make us." Bob said. "Fine, we're making invisible spray." Phineas replied. "Cool." Bill said. "How does it work?" "Well, the carbon nanotubes cause a chain reaction that-" "What?" Bob asked. "Well, when you press the button, it sprays you and you turn invisible." "Oooohhhhh." Bill and Bob said. "Let me try!" "No wait, Bill!" Then Bill sprays himself. He just loses and eye and a leg. "Oh, darn." Phineas said. TO BE CONTINUED