A popular reaction meme featuring the clenched fist of popular cartoon character Arthur. Insert your own caption for a situation when you're angry or frustrated but trying to restrain yourself. In the show, Arthur clenches his fist then punches his little sister DW, but immediately regrets it. Many people relate to the image of Arthur's fist because they too have had a moment of condensed emotions. Insert your own captions to make a relatable Arthur's fist meme.