I don't see this as three direct objects. You generally bet something, like money. " But this is a complicated grammatical construction because here you actually have a dual meaning of the verb "bet": wager and surmise.
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AnonymousSo the sentence is essentially the following:"I'll bet (to) you anything (and I'll surmise) that the guy with the knife went insane and attacked them."I don't agree. "I'll bet you anything that the guy with the knife?" can be interpreted as an offer of a wager or as a guess, but the construction is the same. Whatever the messag