I went through something similarly during my PhD when my advisor printed the main code of the program that we were going to work on. At first I thought he was

I went through something similarly during my PhD when my advisor printed the main code of the program that we were going to work on. At first I thought he was kidding (he's a very chill guy) but... Heck, after a few hours of "paper debugging" we discovered a lot of nasty issues, got new ideas and found redundant and spaghetti code that we didn't find when we debugged digitally (obviously, we were not a team of CS students/coders. Just a bunch of chemists kinda newbies to coding). It was a really useful and funny approach.