If you are creeped out by spiders, you may want to brace yourself.
This video shows a tarantula going through its molting process, which allows it to grow by shedding its exosleleton. Typically the process takes several hours, but here it is condensed into just a couple of minutes. Skip ahead to about 50 seconds in to see the tarantula in finished form.
For more info on Spider Molting, click here: http://science.howstuffworks.com/environmental/life/zoology/insects-arachnids/spider2.htm