A pig with horns runs into a building and makes it fall into the dirt. This makes a loud crash sound. I mean, how could it not? The building literally crashed to the ground when the horned pig attacked it.
You're worried about the pig, that was a pretty big crash, after all. So you yell, "SOOEY (つい)!" Here pig pig pig. SOOEEEYYY! You know—the universal call for pigs
Currently there are no similar looking kanji which exist in the WaniKani learning system