A member said that she felt really bad about not being able to complete a speaking challenge. She couldn't think of any relevant ideas, and the experience made her feel as though she was being irresponsible.
Here's my response:
Please don't worry!!! What matters is that you've thought about the topic. The purpose of our weekly member challenges is to stimulate your mind and broaden your horizons. You may not have an example immediately available, and that is ok! If you've thought about it, that means you've put a request into your subconscious (this may sound like pseudoscience haha!) and one of these days, you will either remember something OR you will notice the event unfolding in your life!! It won't be too late to share your insight with us then.
Completing the challenge is nice, but we're going for something bigger: the expansion of your mind! I'd say you've done the job just fine by starting to think about it!
Next time, if you run into the same issue and you still want to do speaking practice, just turn on the mic and tell us why you've been stuck 
I'm sure many members will be grateful to hear about your experience as it is their own too.