New2grammar can't believe what's on the Internet!
Do you want some more examples? I can give you a lot! You won't believe it!

Yeah, the net is a mess.
As Jim said, in some languages hair is plural (mine too, and that's why I tend to make that mistake and use the plural). But on the other hand, optilang showed you how a certain "strange" expression can be normal in some dialects. Interesting, eh?