Was doing kanji exercises today (reviewing 4 and 3kyuu kanji - procrastination FTW) and i had to write the sentence 「自転車でころんでしまって足が痛い。」, and I couldn't for the life of me remember how to write ころぶ. Turns out it's 転ぶ. That made me feel stupid... I also need to stop confusing 住 and 注. (I never write 住 instead of 注, but I often write 注 instead of 住.)