I saw this one on AFV, and recently on my flist, though I don't recall who posted it. The family won money on America's Funniest Home Videos for this, which makes me happy.
This next one slays me, even though I feel great sympathy for the doggy. It's just that look on his face:
This is an old one, but I still laughed until I thought I was going to have an accident.
And from the Engrish Blog, the toothpaste that hates math:

see funny english mistakes
Now for the high-octane cuteness:

more animals
Now for the most amusing parody of early 70s educational programming I have recently encountered:
"Germs originated in Germany..." Moth Apples!
(no subject)
(no subject)
(Though this one isn't exactly wrong, it's just an uncommon usage. Tartar build up is sometimes called "dental calculus" but not very often.