What are some things that programmers know, but most people don't?

Mad shit from movies:

• You can't zoom in on photos beyond their actual resolution
  
  
• WeACTUALLY DOknow how to talk in human, non-techie language... our jobs depend on it!
  
  
• We're not all fat
  
  
• We're not all fat lazy geniuses
  
  
• Programmers are not electrical engineers... most don't own a soldering iron.
  
  
• Computers don't make high pitched beeps and chirps when displaying data.
  
  
• ...if they did, that would be the first setting disabled by any developer
  
  
• I have no idea how to hack. Neither do my colleagues.
  

Spot on with most of those points! Although I will argue for the last point, the more code you write, the more you'd have screwed up, the more you'd know how to screw things up and therefore the more you'd know what possible ways to screw someone else's code up. There's actually very thin line between tester and hacker xD

For example: a=b is not the same that b=a. isnt it?

Here's what most people don't know but we do:

Programming is really easy to get into.