I noticed something strange and I need an explanation

I noticed something strange and I need an explanation So I watched Superman because it recently came out on Blu-ray. As it was playing, I imitated the characters on sentence I know I would struggle with irl, I did that a lot with Mr. Terrific because he's pretty straight forward with his words. My favorite line from his is "I'm goddamn Mr. Terrific" which also was my favorite to mimic because I have trouble with my "I"s and "g"s. After doing that throughout the whole movie, I found myself speaking fluently even on sentences I knew for a fact I would stutter on. It started with a phone call with an online friend I've only been on a call with once. Our first call, for me at least, was a bit of a disaster, I couldn't talk at all. Always pausing and stuff but this was so different, it was so buttery smooth. Afterwards I had a chat with my aunt on the phone, I'm usually stiff around her and this conversation was also smooth. Next day whilst I was half asleep I had a conversation with the receptionist of the airport I'm interning at, on the phone of course. It also went very smooth. My stutter is the worst when I'm talking to someone I do not know. It's been smooth sailing from there and I've been stutter-free for 3 days now. I do feel it coming back and I'm practicing with another movie Dune 1 and 2. Little pauses here and there. I think I am missing a factor though. Beans and red oil with rice, hear me out. I was eating those as I saw Superman. And after I kinda dropped it. So I'm gonna have those in some hours and see if I improve. I know this sounds crazy. Ignore that last part though, but if anyone can explain this phenomenon, I would appreciate it haha.