You never think about Thanos TOO HARD. Bad and hilarious fails occur. In this case, picturing the giant smug face of a notorious Marvel villain ends up snapping just about everyone in yoga class out of their meditative state. But dang, the story we have here makes the whole thing worth it!
If you want to check out some particularly hilarious and dirty Thanos/Ant-Man memes, check this post out. You won't be disappointed.