>I remember i used to get them when I was reading something i found clever or funny

I have to ask do these zaps feel good, bad, do they hurt, do they tickle. I can't quite imagine what zap is supposed to mean.

Without any history of SSRI use, when I read something funny or clever, I've often experienced a weird feeling which could be described as electric, but also tickly and kind of good feeling. Mostly in my brain and upper spine.

I also get this listening to ASMR audio. Not sure if that's the same thing we're referring to though.

Finally! Someone else with this. Reading Crime and Punishment gives me this feeling, I get zaps and it kinda hurts my brain to read. Only happened with that novel and some Shakespeare.