Write a sentence that humorously turns the following cliché phrase to its opposite: "still waters run deep"
"Raging rapids are only an inch deep, just like my ex's personality."
Complete the following task based on the instruction and optional input provided.### Instruction:
Write a sentence that humorously turns the following cliché phrase to its opposite: "still waters run deep"

### Output:
"Raging rapids are only an inch deep, just like my ex's personality."