That movie is expected to arrive in fall 2015, but in the meantime, we're celebrating Christmas Vacation.. In honor of the holiday classic's 25th anniversary, we're catching up with where the cast is now in the gallery above.
It turns out that the active ingredient in Pepto-Bismol (bismuth subsalicylate) contains a chemical called bismuth. When a small amount of bismuth combines with trace amounts of sulfur, a black-colored substance (bismuth sulfide) is formed.
A black tongue is a harmless side effect, and is so listed in the product's package information. Depending on how much is taken and other factors like age and speed of digestion, Pepto-Bismol can also linger in the system and cause a temporary darkening of the stool, which is also harmless.