I called and said "Cactus." She hung up. I called again and said "Cactus cactus cactus" and she started saying "Cactus" back. This went on for a while with both of us 'cactusing' each other, and then she started singing some song, but she replaced every few words with "Cactus". She concluded with, "Heh heh... thank you... good night".
Best. Call. Ever. I suck for not recording it.