<human>: Provide a brief overview of the text.

This happened around 5 years ago when I was 15.

 My family was on vacation in London and at one point we went to a store that had some military stuff, and I wanted to buy a grenade there with the explosive core taken out. Basically it was the metal, heavy outer part of a grenade with a hollow inside. Of course I had my dad buy it for me and I took it home cause I thought it was too cool. 

When we were sitting in the airport on our layover back from London in Germany, the person at the desk called for me to come to the desk on the speaker. They then proceeded to bring me into a room where multiple soldiers were with guns drawn and ready and my checked bag on the ground in the middle. They asked me to go through it and confused and shaky, I went through the bag. I then realized that the grenade was there and that I was in a potentially terrible situation. I explained to them what it was and they to prove it by pulling the pin. While this confused me because this seemed like a terrible decision on their part, yet there were soldiers with guns out around me, I confidently pulled the pin of the grenade, it didn't explode. Now every time I fly my checked bag is subject to "random searches," as they tell me.  The best part is that the grenade wasn't caught in London but actually later in Germany.
<bot>: I bought a hollowed grenade at a store in London and pulled the pin in front of German soldiers with guns drawn and survived