The argument from contrariness
If I believe in God, it will irritate Richard Dawkins.
Richard Dawkins deserves to be irritated.
Therefore, God exists.
Note: To unlock the hidden wisdom of this syllogism, the wise person will plant his/her tongue firmly in cheek.
Additional note: Credit for this (shall we say) inventive argument goes to Andrew Rilstone, who gives a masterful (not to mention absolutely hilarious) 5-part treatment of Dawkins’ The God Delusion on his blog.