A crocodile can't stick its tongue out.

1. It is impossible to lick your elbow.

2. A crocodile can't stick its tongue out.

3. A shrimp's heart is in its head.

4. In a study of 200,000 ostriches over a period of 80 years, no one reported a single case where an ostrich buried its head in the sand.

5. It is physically impossible for pigs to look up into the sky.

6. A pregnant goldfish is called a twit.

7. More than 50% of the people in the world have never made or received a telephone call.

8. Horses can't vomit.

9. Sixth sick sheik's sixth sheep's sick is said to be the toughest tongue twister in the English language.

10. If you sneeze too hard, you can fracture a rib. If you try to suppress a sneeze, you can rupture a blood vessel in your head or neck and die. If you keep your eyes open by force, they can pop out.

11. Rats multiply so quickly that in 18 months, two rats could have over a million descendants.

12. Wearing headphones for just an hour will increase the bacteria in your ear by 700 times.

13. If the government has no knowledge of aliens, then why does Title 14, Section 1211 of the Code of Federal regulations, implemented on July 16, 1969, make it illegal for U.S. citizens to have any contact with extraterrestrials or their vehicles?

14. In every episode of Seinfeld there is a Superman somewhere.

15. A duck's quack doesn't echo, and no one knows why.

16. 23% of all photocopier faults worldwide are caused by people sitting on them and photocopying their butts.

17. Most lipstick contains fish scales.

18. Like fingerprints, everyone's tongue print is different.

19. Over 75% of people who read this will try to lick their elbow.