Passenger 
To dream of being a passenger indicates that you lack control and allow others to make decisions for you.
Seeing other passengers suggests much effort exerted in gaining the approval of others. You may sense that some people are leeching off you.
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.
President
To dream of the president is associated with power and authority. It may depict your personal assessment of the president.
Puppeteer
To dream that you are a puppeteer hints that you are attempting to overpower or manipulate someone in your life.
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.
Scarecrow
To dream of a scarecrow symbolizes that something is causing you great distress and you are unsure of how to deal with this misery.
Scientist
To dream that you are a scientist symbolizes your desire to try new things and express your individuality.