What is an example of classical conditioning?

Your romantic partner always uses the same shampoo. Soon, the smell of that shampoo makes you feel happy! This is a perfect example of Classical Conditioning.
Classical conditioning is a form of associative learning, which results in a certain unconscious response. Most phobias are a result of unintentional classical conditioning, and, therefore, are examples of classical conditioning. The most famous example of classical conditioning would be Pavlov's dogs. By ringing a bell (neutral stimulus) before presenting food (unconditioned stimulus), the dogs subconsciously associated the two, and salivated (conditioned response) at the mere sound of a bell (conditioned stimulus). Another famous experiment is Watson's "Little Albert" experiment. A small child was presented with an object, such as a stuffed animal, and then heard a loud, clashing noise (something it was naturally afraid of). The small child, after continued exposure to this training, became fearful of the stuffed animals alone.