What's the deal with this? It seems to have an entry here https://knowyourmeme.com/memes/turban but it says it's marked as invalid. Why is this? Sure it's mildly offensive to Sikhs I guess but it's nothing worse than Raptor Jesus/Islamic Rage Boy/Scientology (inb4 not a religion) etc…
In fact a large part of the joke is that people are intentionally mistaking Sikhism for other religions (normally Hinduism and Islam).
For anyone who has no idea what I'm talking about here are some examples:
http://www.facebook.com/pages/my-turban-brings-all-the-girls-to-the-yard-an-theyre-like-mohammed-ur-hard/372674547421
http://www.facebook.com/pages/this-is-not-just-a-turban-this-is-an-MS-turban/343554157869
http://www.facebook.com/pages/OMG-Look-How-Short-That-Girls-Turban-Is-What-a-Slag/105399562823885
http://www.facebook.com/pages/Bruv-Hold-my-turban-Im-gonna-bang-him/365786743123
http://www.facebook.com/pages/LSMMTUAFIMC-Laughing-so-much-my-turban-unravels-and-falls-in-my-curry/409338936419
http://www.facebook.com/pages/im-too-sexy-for-my-turban/337702595993
http://www.facebook.com/pages/Which-Turban-should-I-wear-to-Kates-party/111786625526908
http://www.facebook.com/pages/Why-did-you-just-send-me-loads-of-crap-sorry-turban-fell-on-my-keyboard/103579533010263
http://www.facebook.com/pages/Partys-been-cancelled-FFS-i-already-bought-a-new-turban/111374398874554
There are countless other examples along the same lines so as you can see this is a definite meme with almost all these groups having 100000+ members.