Examples:

• I was as cool as a cucumber.
• Battle of San Juan Hill cool as a cucumber.
• Cool as a cucumber.
• Cool as a cucumber.
• Yes, sir. Young did it, just as cool as a cucumber.
• Yet you you seem completely unaffected through all of this, cool as a cucumber.
• As cool as a cucumber, he walks into the company's office with a skeleton key.
• Cool as a cucumber, this one.
• Cool as a cucumber.
• And there is very little space for the machine to operate in. But Frank is cool as a cucumber as he starts digging.