Barnacles are often found growing on the bottoms of ships and other submerged things. Ships have to go into dry-docks to have these crustaceans chipped from their hulls - as you can see from the photo above, these things can have a serious impact upon the speed and performance of your ship.

In the same way, there are things that are commonly found growing in VBScripts, that serve no real useful purpose and which have an adverse impact on the performance of your script. Some of the common ones are listed below: