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I can read UPC,, UPC-8, ISBN, and EAN bar codes. Tear the numbers off the bottom of the bar code, hand me the lines, and I will tell you the numbers you tore off.
I used to work the midnight shift at a call center back in the late 90s. It was incredibly boring because we weren't allowed to browse the internet when no calls were coming in (which was most of the time, got maybe five calls total per night). So I picked up a copy of Yahoo! Internet Life, a now-defunct technology-centered magazine. This issue had a how-to section for wacky shit like that, so I committed it to memory because wtf else was there to do?
Well that's cool. Can you write in scan-able barcode?
No, there is too much precision required.
If you got graphpaper?
I suppose that might work, it never occurred to me to do so.