Well, @[email protected] reports claiming it with his tongue, so if enough people follow his example, I’d hope occasionally.

EDIT: Apparently a possibility that’s already been considered.

https://en.wikipedia.org/wiki/Cloud_Gate

Since the sculpture was expected to be outdoors, concerns arose that it might retain and conduct heat in a way that would make it too hot to touch during the summer and so cold that one’s tongue might stick to it during the winter.