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By far the hardest step on the list. If you don't have a thermonuclear bomb lying around your house you'll have to progress the story until a very good friend from Bridges give one to you personally. Until then, sadly, you can only wait.
However if you do indeed have one of those devices at your home, head to Distribution Center South of Lake Knot City and get ready to erase that place out of existence.

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This is it. The stars have aligned. All you gotta do now is throw the device directly at their front door. Also, you don't need to knock, since he'll probably hear the sound of imminent death coming from that little package.

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By now you are probably in the middle of your "throwing action" and you might be wondering, "am I even able to survive that?" The anwser is.. Probably? You'll find out soon enough. ( Also the priority here isn't your safety. ) Now brace yourself. The show is about to start.

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If you indeed threw the thermonuclear device your "screen" might wander close to it to personally show to you what you've done. This is it! You actually did it! The devide will go off any second now. ( And I mean any second now. )
No more weirdly named underwear or void-filled things to you, Thomas!

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And just like that he got what he deserved. Sadly you can't actually put a giant crater on Distribution Center 'cause, you probably know by now, no matter what you do Sam will just wake up afterwards like it was just a silly dream. Maybe if you keep exploding that place Sam will start to realize it's not a dream.

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And just like that you successfully obliterated not only Thomas ( and possibly some unrelated people ) but also yourself. Was it fun? Of course it was. You can always come back to life anyway. Should you do it again? ‎‎Yes! Maybe try some new targets even. Like the Engineer or the Movie Dude.