This is when you are not looking forward to something which would ordinarily be awesome or fun, because something terrible or incredibly boring happens directly before it. For example, finals and summer break. One would ordinarily be excited about summer break, however one can't feel the excitement, because they are more stressed over having to climb the mountain (taking finals).
Summer break is right around the corner, but I'm not looking forward to it because of finals. Damn mountain effect.
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