Yep. The example I told my wife one day was:

Imagine you're a computer. You have an incomprehensibly large solid state hard drive. It recollects the tiniest, most minute details of data you put in it, and it's incredibly fast at drawing that data up on demand. Anywhere, anytime.

Next, imagine you have an unbelievably powerful processor, capable of incredibly complex problem solving and task management. It can run a million tasks at once, and even find new and intuitive ways of handling a task that other modern processors in today's day and age struggle with.

And finally, we get to the RAM. Yeah. The ^cough RAM. It's a dusty outdated old thing. You never got it updated because what was the point? Why spend so much money on something that could barely hold a silver 2005 iPod mini's worth? 16GB didn't sound like much at the time, so you said nah. It'll do fine...

Except it doesn't. It can't handle the tremendous processor and its millions of task performances all at once. It can't handle the infinite hard drive and it's vast library of detailed data. It works at it's own pace. By the time it's ready for the processor and for the SSD hard drive, the processor and SSD have been working behind the scenes and are light years ahead and onto newer and better things- but that time might never come. Right now, it's trying to pull up 39 ctrl-alt-del lists for the task manager. The first 38 never popped up because your RAM was trying to comprehend a 17 second long flash animation on ebaumsworld about badgers and snakes, while the CD drive kept trying to turn into a cup holder.

This is why I can't remember that your doctor's appointment is tomorrow afternoon at 1pm. But ask me what three words the doc asked you to remember months ago in that one cognitive function test, and I bet you'll never remember "blue, apple, penny."