Forgetfulness.  Where do the
thoughts go which you are trying to remember? 
They are still there.  Thoughts
are energy.  They do not go away.  You must merely place the intention of
matching the frequency of the concept you are trying to remember and send that
intention outward.  It will catch the
intended thought as a fly to flypaper.  You
need simply let the intention do its job. 
Do you wave flypaper around hoping to catch a random fly?  What a sticky mess that would make!  No. 
Once hung out there, you simply relax and allow it to work.  When that which you are hoping to attract is
caught you will know it.  Do you see how
it works?  The thoughts are no more in
your brain than a fly is.  They are
buzzing around like the energy you hear crackling in high wires, for all is one
great hive of energy.