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The nonstandard Hide is definitely the most annoying.

Once in a while I've pressed the wrong shortcut and saw something I didn't intend to have happen. If it's an action that changes the image, you can Undo. But shortcuts that change tools or affect palettes don't Undo. Luckily, they aren't likely to be harmful, just enough to confuse you momentarily.
 
Billy Boo Bob said:
You want some *killer* keyboard shortcuts? Switch back to Photoshop before you do that. :p

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