Yum:

"I've received numerous e-mails from people with apparently sick birds," writes David Cooper in BirdTimes magazine. "Their lovely pet was sitting nicely on their shoulder and, when the owner turned to give the bird a kiss, up comes the bird's last meal onto the owner. . . . [You've imitated a feeding cue used by nestlings] and your bird will probably do it again. . . . In bird language, you were saying 'please vomit food into my mouth' and your bird has happily obliged."