Signpost
You see a tree with a helicopter and a jackhammer tied to it. You look closer, because this is an odd sight, and realize that there is a sign here too. It's telling you to beware of helicopters and jackhammers in these woods. It's a poorly made signpost!
This is not the best signpost you've ever seen, but it's better than nothing at all, you suppose.
ひょう
しるし
None
As you look at this weird signpost you notice a button. You press it because it will supposedly tell you more about these dangerous helicopters and jackhammers. Instead, it just yells out in a loud obnoxious voice: HEYO (ひょう)!!
Press it a few more times and hear the sound in your head. Also spell it out in kana as you hear it as a nice little additional visual.