When you are drunk and someone tells you something or you find something out, you sober up and forget about it, then get drunk again and you remember? Does this happen to anyone else?
Along the same lines of this: Inhale some herbal vapor then study for a test, take the test without elevation and you don't do as well as anticipated. Inhale some herbal vapor then study for a test, take the test higher than the noon and get an A+, bomb dig nig.