There are stones that smell like trash in the river. You reach in and realize these rocks are made of sulfur. Even the flow of this water can't hide the stink of these sulfur rocks.

You throw the sulfur rock as hard as you can, but it hits someone in the back of the head. Oh no, it's Ryu (りゅう) from Street Fighter. You try to apologize and explain that you just didn't want this stinky trash rock, I mean, sulfur rock near you. You didn't know he was there.