What to do when you forget!

This evening I was having a conversation with one of my black belt students/friend. We were discussing some basics on a variety of Taekwon-Do techniques. During our talks we couldn't immediately think of answers to some of our questions. We both laughed and felt slightly embarrassed because we are senior ranking black belts. Additionally, we are humble black belts who admit to not always having the answers, but definitely know where to get the answers. As we were speaking, I shared an analogy. I stated the following: Image a bucket filled with water. The water symbolizes knowledge that we learn in martial arts training. Now, imagine a sponge. This sponge symbolizes our brain (memory). When we submerge the sponge into the bucket of water (knowledge) the sponge absorbs a lot of water. However, when you take the sponge out of the water...what happens? Water will drip out of the sponge. Symbolizing that we will lose/forget knowledge. The sponge is still wet and moist...still has knowledge, but the not the same amount when it was in the bucket of water. That is why it's important to constantly return to the bucket to refresh our memories. I've noticed how knowledge in certain topics and for certain people become important when the information is relevant. Anyway, "soak" that up and let me know your thoughts.