Just when you thought it was safe to go back into the supermarket, Alan Canfield of Diet Chocolate Fudge soda fame ("Too Hot to Handle," March 1987) is coming out with yet another new soda. After bombing with Diet Cherry Chocolate Fudge and Diet Peanut Chocolate Fudge, he's decided to try something different: Hubba Bubba Bubble Gum soda, under license from Wrigley and -- you guessed it -- authentically pink-colored. Some guys just don't know when to quit.