If you pick certain rice or flowers you'll be put in prison. The most famous of these is the chrysanthemum. Chrysanthemums are super important in Japan because they're the symbol of the imperial family. They're even on the cover of Japanese passports. If you get caught picking a chrysanthemum, you're going to prison.
If you go to prison for chrysanthemum picking, everyone in the prison is going to kick (きく) you nonstop. You broke the chrysanthemum picking law, so kicking is your punishment. And believe me, you don't want these kicks.
Currently there are no similar looking kanji which exist in the WaniKani learning system