The particle *too* has long been known to trigger an additive presupposition*,
*namely that a proposition that contrasts minimally with the host of *too *is
true in the context. We show that the adjectives *same *and *different *also
generate additive presuppositions and argue that these adjectives decompose
into two parts: *too* and a (non-)identity predicate. We show how this
proposal accounts for known properties of *same* and *too *(parallelism
effects and internal readings) as well as a previously unsolved puzzle
regarding the distribution of *same *and *different *in comparative
constructions.