Sure! Here's a sarcastic sign idea that could convey your message in a humorous yet admonishing way:

Title: "Toilet Flush Training: Basic Skills for the Uninitiated"

Subtitle: "Flush Like a Pro and Leave Your Mark (In the Bowl, Not on the Seat!)"

Course Description: "Tired of finding surprises in the bathroom? Join our exclusive training program and master the art of flushing! Our expert instructors will guide you through the proper techniques for safely, efficiently, and confidently operating the flush switch. Say goodbye to unnecessary messes and hello to a sparkling clean bathroom! Enroll now and earn your 'Flushologist' certificate."

Additional Text:

"No more flush fails or phantom smells!"
"Learn the secrets of the elusive flush button."
"Join us and flush away your bathroom blues!"
"Don't be a bathroom bandit, flush it like you mean it!"
"It's time to flush and farewell to foul odors."
Remember to use humor with caution and consider the office environment and culture when creating a sign. It's important to strike a balance between humor and professionalism to effectively convey your message.
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