Algodoo

I tried to play Factorio with my friend, but Hamachi was dead.
Then i showed my engine to my friend, it quickly broke. We noticed, that it looks like a crab. I gave a sword to it, and made it "attack" Hamachi logo.

And then... many other bad programs(almost all - russian, that installs with other useful programs and games) was added, and we made them suffer.