Anybody ever forget to grab a gun when it is needed

I can think of only two instances where I should have grabbed a gun and I just forgot.

First time, I was coming home to my apartment from a party. It was like 2 AM. Some drug addict looking guy was staring at me in the parking garage. I did not say a word. I just walked briskly down the long hallway which had many twists and turns to my apartment. I looked over my should once and I could see he was following me. I got in my apt and locked the door. About 5 minutes later the drug addict looking guy is knocking on my door. He continues to pound on it again and again. I'm just standing there stunned. I don't know if I should open the door and beat his arse or what. I ignore it and he goes away. I should have just grabbed my handgun or shotgun and waited. If he breaks the door down be ready.

Second time, my wife wakes up me up in the middle of the night and she is scared. Says she heard someone knocking on the front door and now she hears noises in the house. I stumble out of bed and start searching the house. I come back and said nobody is on this side of the house but I will now check the other side. She says why don't you grab a gun! I said, oh yeah!!! I even have a tactical light on my night stand handgun which is loaded. It will make searching easier too. I scope out the rest of the house and everything is cleared and every door is locked.