For me, BY FAR the most euphoric plant I ever had was a pheno from a bunch of F2 Cindy99s, by an Aussie breeder who unfortunately is no longer active.
It just put this huge smile on your face, the, when you sat down, the smile just grew and grew, while the rest of you melted away until only that enormous goofy smile was left! I called it the "Cheshire Cat" pheno - Alice fans will understand....
Don't have it any more, sadly..
Gert shared these seeds with me and I agree 100%