["My coworker stole my presentation idea and claimed it was his, I can't believe it.", 'WHAT? did, you have any idea beforehand,  or he just showed up with your idea.', 'He showed up with my idea so not only was I so mad but embarrassed to because it looked like I stole from him!']
OH no! I didnt even think about that.  That must have been terrible.
My coworker stole my presentation idea and claimed it was his!