you brought it on yourself miss twiddle

Sejanus forewarned Tiberius that Drusus would try to poison him. So when Tiberius was offered a cup (poisoned by Sejanus) at a banquet, he passed it on to Drusus, whose subsequent death was taken as proof of his guilt (not of his innocence) on the ground that he had drunk it to commit suicide because Tiberius' refusal to drink showed that his attempt at murder had been detected (Ann. 4.10). That is to say: Tiberius is induced to misunderstand the offer of the cup and to attempt unnecessary self-defense, which, in fact, becomes the apparently unintended murder of Drusus mistakenly seen as suicide for a failed attempt to murder Tiberius by Drusus himself, who is in fact murdered by Sejanus. (Paul Plass 1988 Wit and the Writing of History U-Wisconsin.)