Connor's been putting "more" and "please" together for a while now and we have him say "all done" at the table when he's done with his meal, but those have been specifically prompted, so they don't really count.
Yesterday morning, we were getting ready and he heard the trash truck outside moving from house to house and was fixated, saying "car" repeatedly as he got dressed. On the way down the stairs, the truck drove past our front door to pick up our trash and he saw it and spontaneously said "bye bye car". Yup, beaming. Misha told me he also said "bye bubbles" as the tub drained (she had given him a bubble bath).
Next stop: Quantum differential equations