Chekhov's Skill/Playing With

Basic Trope: A character learns a seemingly innocuous skill that they later end up using in an awesome fashion.
 * Straight: Alice learns how to be a ballerina while traveling the world to gain experience for a major job interview. In the end, that ballerina skill gets her the job.
 * Exaggerated: Alice learns how to balance a checkbook. In the end, she's the only one given a major job offer because she knows how to do exactly that.
 * Justified: Skills can come into play in different fashions. You never know when what you're learning will come in handy.
 * Inverted:
 * Alice learns an awesome skill like flying a plane - but only uses it for its most obvious applications.
 * After doing something awesome, Alice is unable to successfully do it again.
 * Subverted: Alice learns a skill. Later, she tries to use the skill, but fails.
 * Double Subverted: But even later on, she tries again and succeeds.
 * Parodied: Alice learns an incredibly useful skill that everyone should know, like riding a bike. Everyone treats The Reveal that she knows how to do this like an amazing thing.
 * Deconstructed: Alice lucked out that time, but some of her skills end up being useless.
 * Reconstructed: Until she finds uses for them as well.
 * Zig Zagged: ???
 * Averted: The skill never comes up.
 * Enforced: "So we need to reward the viewers that are paying attention. Let's have this ballerina lesson she goes to end up being vital later on."
 * Lampshaded: "You need a ballerina? How lucky."
 * Invoked: The people who posted the job wanted someone well-rounded.
 * Defied: "I don't care if you're a ballerina. What can you do for this company?"
 * Discussed: "Employers always have their quirks. I'm sure my ballet skills will be needed at some point."
 * Conversed: "Lets see, she learned sniping, military tactics, subterfuge, interrogation technique, and ballet. Guess which one she'll need to use at the climax."

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