I learned this with keeping cockatiels a couple decades ago. Letting a bird perch above you is linked to some serious behavioral problems in parrots -- even tiny budgerigars. :eek:
In addition to the risk of being blinded by a curiosity peck,
Never allow a bird to sit with it's eyes above your eyes. The dominant bird perches the highest and you do NOT want a chicken, especially a rooster, thinking it's dominant over you.