I hope that you enjoyed Saturday’s Mac Riddles, episode 108. Here are my solutions to them.
1: Etching, impression or papa for short. What am I?
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Etching (a print), impression (a print) or papa for short (Command-P is its shortcut). What am I?
2: An intangible shop selling only intangibles, excluding itself.
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App Store
An intangible shop (the store itself) selling only intangibles (apps), excluding itself (the App Store app isn’t among it products, though).
3: Here are plenty of keys but no lock, and they aren’t even in alphabetical order.
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dictionary
Here are plenty of keys (a Plist/macOS dictionary contains key-value pairs) but no lock (not a keyboard, which has a Caps Lock), and they aren’t even in alphabetical order (the contents of a dictionary are normally unsorted).
I look forward to your putting alternative cases.