Anyone else know certain kinds of 'code writing' off by heart, but know they're not really going to be useful to you?

First time posting instead of commenting on this sub.

Now, a few years ago I read this sci-fi themed book series about time travel (won't go into detail here), and one of the books used the pigpen cipher as an important thing for the plot.

https://en.wikipedia.org/wiki/Pigpen_cipher

Now, a few years later, I can remember exactly how to write like this while barely needing to think about it. Although I do think it's quite an easy thing to learn. Might be nothing to do with Aspergers but then again, ya never know.

Anyone else know code writing and stuff, like Morse code for example, off by heart? Dunno why I posted this but I did so yeah.

P.S, funny little story that happened a couple years back in school. This was a while after I finished the previously mentioned book series. In a class one day the starter task was to decode a message in the pigpen cipher and literally everyone in the class except for me couldn't understand it LOL. I found that amusing at the time.