There you go! Don’t be a lobster, stay on the boardwalk!
I’ve taken trails in the back areas of Yellowstone to some of these smokestack or chimney geysers, and have looked down the stack - hoping they wouldn’t be spouting off at the same time I was looking down them. I was walking very gingerly on the ground around them, making sure I wasn’t going to fall through a thin crust, either ... :-) ...
I couldn’t find a good picture of one, or I would have included it here.