C'mon... We all went through that phase so without a doubt we have cringeworthy stories about it so let's all be embarassed together!
I went through a chuunibyou phase in my elementary through first year of middle school where I thought/pretended to be necromancer and brought dead things to life. I used to carry around this stuffed animal bat that had a skull motif on it's face and called it my "medium" between the dead and the living. It's stupid looking back at this but it was fun while it lasted.