Have you ever had a really bad kiss? Well, hopefully your experience wasn't as bad as it is for a female white-fronted parrot.
Courting begins innocently enough for these parrots. In fact, they display one of the few known cases of mouth-to-mouth kissing in the animal world. (Awww, parrots kissing.) But for the male parrot, slipping the tongue isn't enough. After making out for a while, the male becomes sufficiently aroused, prompting them to vomit straight into their lover's mouth. (Ewww, parrots kissing!)
Lucky for male parrots, females typically accept this "gift" as a sign of intimacy.