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The "past tense" of think.

"I just got an idea!" "way to go, Boris!" "<proudly>I thunk it up myself.</proudly>".

This is not proper spelling, but is instead hackish (or one could argue, childish) as it an overgeneralization of other similarly-spelled words. The thinkology is as follows:

"Sink" → "sank" → "sunk" (correct english)

"drink" → "drank" (correct up to this point) → "drunk" (incorrect, but often done for humorous value)

Therefore: "think" → "thank" → "thunk".

"Thank" is not used (nearly as often as "thunk" is,)? as it's already a real word (and unlike "drunk" offers little/no humour value).