How do you "lose" a thought? Where does it go?

Same place where socks, cell phones and keys go... I call it the lost dimension.

Damn I forgot what I was going to say.

All thoughts are stored as energy...or memory in the brain, so every thought you have ever had consciously or otherwise is in there somewhere. There are many causes as to why memories seem to be lost or impossible to retrieve, in my case it is neurotoxins. My synapses do not fire on all cylinders these days so trying to remember anything past this morning is difficult.

i just had one to answer this question but lost it, going to see if i can find it be back with the rest of the answer later

mmmm...uhh...well...I...What was the question?

Same place as it came from back into the recesses of that black hole that I call a brain, with a little luck it pops up again at some time , Usually when the information is absolutely useless to me but I still get quite excited that I have managed to find this lost information, Like finding your other glove after you have found a second pair

Sometimes i think my subconscious has 'butter fingers'. Thoughts slip through my 'fingers' and get lost in the 'vault'. If only the mind could use the Dewey Decimal System...

A thought is like a ball in your hand. Sometimes, you have a thought, and then another thought and you try to carry them both (or more) to the destination where thought #1 is applicable. Usually, we drop the thought on the way, but arrive at the place we were going to use it, then can't remember what we are doing there. The best way to get the thought back is: return to where you had it and you will find it again.

It takes a journey to the 'Dark side of the brain', lost amongst older forgotten thoughts.