What have people been throwing into the geyser? Some of the historical detritus that Ear Spring coughed up includes a large chunk of cinder block, a broken bottle, several metal warning signs, some aluminum cans, plastic cups, cigarette butts, someone’s rubber heel insert, a vintage pacifier from the 1930s and an 8-inch-long plastic drinking straw. (Editor’s note: please do not try to drink a geyser.)

Whether these foreign objects were dropped into the geyser accidentally or chucked in on purpose makes no difference. Either way, park officials wrote, they were bad for the geyser.

“Foreign objects can damage hot springs and geysers,” park officials wrote on Facebook. “The next time Ear Spring erupts we hope it’s nothing but natural rocks and water.”