What do these three things have in commmon?
A sandwich shop, a computer and a casino.
— from The Puzzling World of Winston Breen
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1$\begingroup$ Welcome to Puzzling.SE! Note in the future that you can wait a few hours before accepting an answer, so that the puzzle gets more attention. $\endgroup$ – Quintec Dec 31 '18 at 18:27
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Could it be
they all have chips? A sandwich shop has a chip card reader (and potato chips, thanks @deep thought), a computer has computer chips, and a casino has poker chips.
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$\begingroup$ @deepthought Haha, that should've been more obvious, I guess I live in the tech age... thanks $\endgroup$ – Quintec Dec 31 '18 at 22:47
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I know this already has an accepted answer, but how about:
Virus - spoiled food (i.e. potentially romaine lettuce in the US in Nov. and Dec.), a computer virus (malware, Trojan, etc.), the "Lady-of-the-Night" sorta virus (well, you know ;-P)
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Also, they all have or are
wafers. For example, a sandwich shop with a sufficiently wide repertoire would carry cookie sandwiches, which include wafers. Many computer components are built on wafers. And then there are Casino wafers.
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What about:
The letter C (works with O too). A sandwich shop, a computer and a casino.
