Would someone please explain this joke?

My dad spams me with awful things a dozen times every day. I made the mistake of reading this one, and I just don't get it.


>I saw my mate Charlie this morning, he's only got one arm bless him.
>I shouted - "Where you off to Charlie?"
>
>He said, "I'm off to change a light bulb."
>
>Well I just cracked up, couldn't stop laughing, then said,
"That's gonna be a bit awkward init?"
>
>"Not really." he said. "I still have the receipt, you insensitive bastard."

Is Charlie slang for something? Is the joke that it's hard to change a lightbulb with one arm? Why did Charlie buy a lightbulb if he's planning to return it? Why is it insensitive to laugh about his lightbulb?

Trying to understand this joke is the hardest thing I've ever done.

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