Helping citizens recognize fake news as fake has been a popular approach for curtailing the effect of misinformation. However, this paper points to its limitation by revealing that misinformation that we already know is false can still change our beliefs and attitudes. In five experiments, participants who were thoroughly instructed that they were going to read a made-up article still ended up believing the content and changed their political preferences or behavioral intentions. The effects are resistant to corrective efforts and persistent across time. People exposed to misinformation they knew to be false still believe the content despite being instructed to be deliberative and to try to not be affected or provided with the real information. The effects were observable two days later and again nine days later after the initial exposure. These findings have profound implications for misinformation research, media practices, polarization and democracy, and common research practices, such as deception and debriefing after deception.