The latest (March 2010) issue of the BBC’s popular science magazine Focus contains an article busting some of the world’s most common myths.  For example:

Goldfish have short memories. 
False; they have memories which last at least a week according to experiments.

Sugar makes kids hyperactive. 
Experimentally proven to be false.  But that’ll be about as popular a result as the finding that MMR vaccine doesn’t cause autism.

Men with big feet have big penises. 
Sorry girls, also false, according to just about every survey ever conducted.  There is no reliable way to determine the size of a guy’s lingam without seeing it.  Enjoy!

At the end of the article they add a few new myths suggested by readers, including the following with rather zen qualities …

In the era of black and white films,the world was black and white.
According to which logic the world didn’t exist before films were invented.  Interesting idea for a thriller story though!

When you jump up, the world moves forwards a bit before you land, so you touch down in a slightly different place.
This is an old one and I’ll get into trouble with the science community here but I reckon this is actually true.  When you jump the world moves on, but so do you as you have angular momentum (essentially forward motion) from when you were attached to earth.  However you will, I suggest, be slowed very marginally by friction with (resistance from) the air and thus will land in a subtly different spot from where you jumped.  But this effect will be so tiny it will be unmeasurable even after a huge number of jumps.  So for all practical purposes this is also false.

People with outie belly buttons are more attracted to people with innie belly buttons because they fit together: like a jigsaw
Would that life were so simple.  But if it were around 80% of us would be single as outies make up only around 10% of the population.  And no-one knows why.

Every zebra, when scanned by a barcode reader, comes up as ‘frozen peas’.
Unless there is some strange default barcode which defaults to “frozen peas” (very unlikely) this can’t be true as a zebra’s stripes do not conform to the coding of thick and thin lines which make up a barcode.  But I love the zen quality of the idea.  Another good plot-line for a short story?

Anyone got any other new myths?