So I was reading this thread, and this reminds me of a common fact: that smell is often linked to memory. And a good smell gives wonderful memories. For example, who in this room can recall the orange grove smell from Horizons?
On a similar note, there should be an orange grove cologne at a souvenire shop to bring back memories. Oh, and I really hope that they won't make it out of blue-furred-alien-experiment-chilli-dog-breath scent. XC