Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
It's what ninja do to conceal their identities.
As for the case of the turtles, it's clearly for identity purposes in order to easily tell them apart.