Porcupine 
To dream of a porcupine points to a need to defend and protect yourself from emotional or psychological harm.
Alternatively, it indicates possibility of a situation which requires openness on your part. This also suggests the present of someone in your life who shields his/her vulnerability.
Rehearsal
To dream that you are attending a rehearsal suggests that you are preparing yourself to deal with the realities of the outside world.
Sandpaper
To dream of sandpaper indicates that you are experiencing a difficulty or crisis in a relationship. In addition, it may suggest that you need to change your aggressive and severe approach or outlook towards a certain situation.
Saxophone
To dream of a saxophone represents that you are harboring unresolved feelings that you need to convey. Perhaps someone has greatly influenced you or changed your life in some way.
Sea Horse
To dream of a sea horse signifies the strength of your instinct and intuition. It may also symbolize a change in perception or attitude.
If the sea horse is invisible, then it indicates that you need to face your personal concerns rather than trying to evade them. Perhaps you need to adopt a fresh approach to a situation.
Shoulders
To dream of your shoulders represents intensity, reliability, and afflictions. You may have been expected to handle too many obligations and certain situations are arduous for you to endure. Shoulders also symbolize your aptitude for offering encouragement and caring.
Spaghetti
To dream of seeing or eating spaghetti implies that you feel trapped in a situation involving someone else. It's possible that you want to move on but aren't sure of which procedure to use. This issue is making you feel awkward.
Teakettle
To dream of a teakettle foreshadows that ominous news will soon reach you.
Threshing
To dream about threshing grain symbolizes progress in commerce and familial happiness.