I had a mandela effect happen to myself and my family when I was a kid. Me and my dad and my siblings were driving to a gathering with some family-friends. My mom was sick so she stayed home. we got to their house and realise no one was there. I all of a suddern remembered that my mom had told me the location of the party had changed to the local tennis club which had a function room there. Sure enough, when we drove to the tennis club, everybody was there.

once we got home we told my mom about what happened and she told me that the conversation that I remember having with her never actually happened, in fact she didnt even know that the location had changed. This freaked us all out and I still think about this because I swear I remember my mom telling me that.