quirk

A quirk is an odd occurrence or a unique and peculiar behavior or characteristic. (noun)

When a strange twist of fate leads you to bump into your old high school sweetheart and you end up getting married, this is an example of a quirk of fate.
When you have to do something sort of odd, like spin around twice before sitting in your chair, this is an example of a behavioral quirk.

See quirk in Webster's New World College Dictionary

noun

1. a sudden twist, turn, or stroke: a quirk of fortune
2. a flourish in writing
an evasion, subterfuge, or quibble
a peculiarity, peculiar trait, or mannerism
Now Rare a clever turn of speech; sally; quip
Archit. a groove running lengthwise in a molding

transitive verb

Archit. to form with quirks

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See quirk in American Heritage Dictionary 4

(kwûrk)

noun

A peculiarity of behavior; an idiosyncrasy: “Every man had his own quirks and twists” (Harriet Beecher Stowe).
An unpredictable or unaccountable act or event; a vagary: a quirk of fate.
A sudden sharp turn or twist.
An equivocation; a quibble.
Architecture A lengthwise groove on a molding between the convex upper part and the soffit.

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