The ultimate how-dump-am-I -test!
(Obviously stolen from Chichika. xD)

The more [x]'s the dumber you are.
Be completely Honest!

18 or lower means you're not stupid.

[X] Gum has fallen out of your mouth when you were talking.

[X] Gum has fallen out of your mouth when you were NOT talking

[X] You have ran into a glass/screen door.

[X] You have jumped out/off of a moving vehicle.

[XXXXXXXX] You have thought of something funny and laughed out loud, then people gave you weird looks. (I do it a lot. Like really, A LOT. xD)

[ ] You have ran into a tree.

[X] It Is possible to lick your elbow

[X] You just tried to lick your elbow.

[X] You never knew that the Alphabet and Twinkle Twinkle Little Star have the same rhythm.

[X] You just tried to sing them.

[X] You have tripped on your shoelace and fallen.

[X] You have choked on your own spit

[ ] You have seen the the Matrix and still don't get it.

[X] You didn't notice that in the last question "the" was spelled twice.

[X] You just looked at it

[ ] Your hair is blonde/dirty blonde.

[X] People have called you slow

[ ] You have accidentally caught something on fire

[ ] You tried to drink out of a straw, but it went into your nose/eyes.

[ ] You have caught yourself drooling.

[X] You've fallen asleep in class

[ ] If someone says "fart" you laugh.

[X] Sometimes you just stop thinking.

[X] You are telling a story and forget what you were talking about.

[X] People shake their heads and walk away from you

[ ] You are often told to use your "inside voice"

[ ] You use your fingers to do simple math.

[X] You have eaten a bug.

[X] You are taking this test when you should be doing something important.

[X] You have put your clothes on backwards or inside out, and didn't realize it

[X] You've looked all over for something and realized it was in your hand, hair or pocket.

[ ] You sometimes post bulletins because you are scared that what they say will happen to you if you don't even when you know it won't happen to you

[X] You break a lot of things.

[ ] Your friends know not to use big words around you.

[ ] You sometimes tilt your head when you're confused.

[x] You have fallen out of your chair before.

[X] When you're laying in bed, you try to find pictures in the texture of the ceiling

[X] The word "umm" is used many times a day

26! (If I counted right.) Well, can't deny it. Not a surprise. xD
And I think I should get some bonus points for the laughing at my own thoughts part. Because I really do it a lot. Last time I did it in the school cafeteria. I was drinking milk while thought of something extremely funny and... Well, you can imagine the rest. xD People really gave me weird looks because of that. And I couldn't even tell them what the funny thing was because I forgot it! xDD