9. No one knows if they are good or evil

8. They both live on Earth (or so we think)

7. Mulder and Scully can make them look disgruntled

6. They both have ears that stick out

5. They almost never talk about themselves

4. They've both been around a while

3. Their feet are both planted firmly on (in?)the ground

2. They both wear glasses with the little rounded parts for your ears

1. They both look like cartoon potatoes