just one leaf curling?

[iwantFUEGO]

one of the younger leaves at the top is curling longways.. almost making the leaf appear very thin and lanky ( but is actually just curling under).
Its only ONE leaf tho, on the whole plant.
All the other ones look fine.
Any ideas?:confused:

[LIP]

I get this sometimes, leave it and it should just straighten back out

[iwantFUEGO]

thanks m8