If your rabbit screams, they need medical attention immediately. Maia screamed when I took her to the vet to be spayed. In this case, she was not in pain but was terrified of the experience. Chinning Rabbits, both males and females, rub their chins on items to indicate that they belong to them. This includes furniture, food, other rabbits, and people.
Rabbits have a scent gland under their chin that leaves a trace smell only they can recognize.
Cats do the same thing by rubbing their foreheads on people and objects. The Binky Witnessing a binky is one of the greatest joys of living with a rabbit. It looks like dancing or leaping in the air, often with body gyrations and kicks and flips. The binky indicates pure happiness and joy, and it's contagious. Other bunnies may join in, and you'll surely be moved to smile or laugh.