There's a cool computer game that makes this point as part of the story line... I'd recommend it, but I can't recommend it in this context without it being a spoiler!
Programmer Humor
Welcome to Programmer Humor!
This is a place where you can post jokes, memes, humor, etc. related to programming!
For sharing awful code theres also Programming Horror.
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Related book recommendation!!
Kil'n People by David Brin - it's a futuristic Murder Mystery Novel about a society where people copy their consciousnesses to temporary clay clones to do mundane tasks for them. Got some really interesting discussions about what constitutes personhood!
I don't get it
The joke is that there are some people who think that by uploading themselves into a machine "to live forever," their consciousness will also be transferred, like when you travel by bus from one city to another. In reality, you "upload yourself," but that yourself is not you, but a copy of you. So, once the copy is done, you will still be in your original body, and the copy will "think" it is you, but it's not you. It's a copy of you! So, you continue to live in your body until you die, and, well, for you - that's it. You're dead. You're not living. You're finished. Everything is black. Void. Null. Done - unless you believe in the afterlife, so you'll be in heaven, hell, purgatory or whatever, but the point is, you're not longer on Earth "living forever." That's just some other entity who thinks it is you, but it's not you (again, because you're dead.)
This is represented by the parameters being passed by value (a copy) instead of by reference (same data) in the poster's image.
I know myself deeply enough to be totally fine with a copy. I’d be my own copy’s pet if it came to that. I trust me.