Overlooking the obvious. It's when you're searching everywhere in the refrigerator for the milk, only to fail to notice that it's right in front of you.
1. "I can't find my keys."
"Hey Refrigerator eyes, they are in your hand."
2. Looking for your sunglasses when they are perched on top of your head.
3. Trying to find a pen to write with while it's already in your pocket.
4. Looking for your phone while talking on it and not realizing it's in your hand.