For Goat Simulator, its unclear whether the developers were trying to make a good game, or invade as many other games as possible. Maybe they were trying to do both.
Goat Simulator has already invaded Dota 2, and it will be coming to Payday 2 very soon.
The Goat Simulator Heist for Payday 2 will cost $6.99 USD. The DLC includes a new 2-day heist, 4 masks, 4 patterns, 4 materials, 1 new shotgun secondary weapon, 4 melee weapons, 5 new achievements, and 2 new songs by Simon Viklund.
A description on the Payday 2 website reads the following, “When the payday gang were ordered by vlad to intercept a truck carrying cocaine,they expected to act as clean-up and collect the goods. Easy peasy. Or at least that’s what they thought. But as they arrive on the scene and see the crashed truck, there are no cocaine packages in sight… only goats… and chaos…”
Full details can be found on the website.