Ear Spring Geyser found in Yellowstone National Park, experienced it's biggest eruption in decades on September 15, 2018. The geyser spewed trash that had been thrown in there by visitors for decades.
According to the science based website Science Alert, among the items spewed out were plastic utensils, crumpled foil, cans, and a 1930's pacifier. Check out Yellowstone National Park's Facebook page to see some of the catalogued items.
Throwing any items into geysers and springs can cause damage to them. This reminds me of the old adage from Woodsy Owl,"Give a hoot and don't pollute!"