The correct response to "We did a project just like this in 8th grade!"

This just occurred to me. 

When, as happens in PBL schools, students inform you that they already did a project that, to them, sounds similar to your project, and you can hear their frustration that they're just going to be going over old ground, the correct response is "Thank God for that. If lots of you have experience in this, that means we can make this product to a professional standard."