(half the poison for the same quanta + 1 turn delay + chance of being prematurely killed - bypassing stuff like Null Mantis - chance to deal some minor physical damage to slightly offset that poison count)
FTFY (corrections italicised), lemme know if I missed anything on either side of the ledger.
Having said that, tho, yes, it'd be pretty funny. Not quite sure how would the AI react to that, though.