I've been playing Fallout: New Vegas since the game was released. I've tried just about every weapon in the game and each DLC. I've collected all unique weapons, armors and such. I thought that some of the weapons were rather gimmicky though others may disagree, and possibly rightfully so. One of the weapons I had not tried was the:

Holy Frag Grenade

I'd never read about the HFG since I like to collect various unique weapons and armor just to honestly say that I did yet haven't tried them for the aforementioned reasons. I normally place those weapons on display especially the HFG since there was only three of them. I wanted to provide proof that I had honestly collected the unique weapon(s) in the Underground Hideout mod's Display Room; which seemed natural for someone like me though I do have my uninhibited moments where imma gonna destroy everything.  

Earlier this morning I decided to start a new 'Cause Chaos Throughout NV' playthrough in which I didn't care what was in the way I would mow them down. Several in-game days later (and a ton of bodies) I wound-up at Camp Searchlight. After defeating the two geckos (double-barrel shotgun FTW!) I grabbed the prize. Kept the nades in inventory on the chance I felt the need to use them would arise. And, it did.

Reached Nipton a day later when the Frumentarii Vulpis Inculta was just exiting Nipton Hall. At that point in the game I was hell-bent on destroying the Legion through any means at my disposal. Having Project Nevada installed the HFG was hot-key equipped and I got the wild hair to use the nade.

Upon approaching the group of Legion I let her rip then charged headlong into mass with my Double-Barrel Shotgun blazing. Mowing those bastards down like no tomorrow. Then the nade went-off...

There were body parts flying through the air. Legs, arms and such. Including mine. Momma, I just made a big mistake. Doh!

What compounded the error in judgement was the last manual save was right outside of Camp Searchlight. I don't use fast-travel so I walked all the way back.

What brings me to tell you this tale is there are moments where we have all had lapses of good judgement.

What are your stories?

I once decided it would be a good idea to delve alone into a Viper-infested mountain campground... With nothing but a Mosin Nagant, 1911, and my trusty combat knife. It was a very bad idea.

It went quite smoothly at first but eventually I reached the center of the campground. I advanced beyond cover and quicksaved. About 1 second later, a barrage of fireballs flew from the distance, killing me instantly.

I eventually, after about 9 attempts, made it safely back to cover. Those fireballs were coming from a unique Viper boss. I killed him with my knife and scored the loot. It wasn't worth the suffering overall.