You see a tree growing on a cliff and it has ten thousand horse chestnuts growing on it. These trees are rare, only grow on cliffs, and they always have exactly ten thousand horse chestnuts on each one.
You decide to take a bite of a horse chestnut because it looks yummy, and there are ten thousand, so it's not like anyone will notice. You crack it open and take a nice big bite to find out that it tastes like toe cheese (とち)! UHG! It's the worst thing you've ever tasted. Like hot, moldy toe cheese! Ewwww!
Currently there are no similar looking kanji which exist in the WaniKani learning system