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Foolishness is bound in the heart of a child; but the rod of correction shall drive it far from him. Proverbs 22:15
Here is a plot of the number of absurd passages in each book of the Bible.
Leviticus and Genesis are in the lead here, with 155 and 151, respectively.
But since the books of the Bible vary greatly in length (from 2,527 verses in the Psalms to only 13 verses in 2 John), we might want to adjust our metric accordingly. The following graph does this by plotting the number of absurd things per 100 verses in each book.
When this is done, Jonah and Revelation take the lead, with 25 and 23 absurd things per 100 verses, respectively.