I love to flip that around in an interview before it even comes up, one of the 3 things I start out any interview with is:

"I'm your Google, anything you'd need to look up just ask me and I'll give you the answer".

Great way to take the pressure off plus it gives you a good idea on how well they ask questions/are comfortable leaning on others. It's a huge plus if I can get a reasonable candidate to admit that there might be parts of the problem at hand they don't understand.