Why is it called the Elvis operator?

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1. #second
2. #operator
3. #distinction
4. #emoticon
5. #implicitly
6. #which
7. #resemblance
8. #boolean
9. #value
10. #operand
11. #references
12. #elvis
13. #presley
14. #necessary
15. #convertible
16. #refers
17. #notations
18. #otherwise
19. #because
20. #returned