Goal:
soap
Answer:
can be bitten by a mouth using teeth.

Goal:
If you suspect someone is checking you out
Answer:
Yawn. If they yawn back, they were. Yawning is visually contagious.

Goal:
highlighter
Answer:
shows paint where

Goal:
How do you use clothes to look shorter?
Answer:
Wear a top that is different in color than your bottom.