while true; do printf \\$(printf '%03o' $((32+92*$((RANDOM%2))))); done;

Was wondering if anyone has any playful one-liners for any system. Recently I was a conference and a Commodore 64 emulator was used to show 10 PRINT CHR$(205.5+RND(1)); : GOTO 10 which generates a maze like pattern using PETSCII. ASCII (at least in my terminal and my fonts) doesn't readily define a standard full-character right or left diagonal line or else I would've shared that, this code alternates between the pipe | character and a space.