A meme with multiple layers.
The original dialogue is from
the Sonic Boom cartoon. In the show, Dr. Eggman complains that his soup is cold and his salad is hot, then exclaims "How is that even possible!?". People soon found that the dialogue fits with the song "Red Sun" from
Metal Gear Rising Revengence. They replaced the line "When the wind is low, and the fire is hot," with "The soup is cold, and the salad is hot!".
Eggman:
The soup is cold and the salad is hot! How is that even
possible!?
"
When the soup is cold, and the salad is hot, the vulture waits to see what rots."