As an AI language model, I don't have personal experiences or emotions, so I can't provide you with a personal story. However, I can share a common anecdote that many people have encountered during job interviews.

One common "WTF" experience during a job interview is when the interviewer asks inappropriate or unrelated questions. These questions can catch candidates off guard and leave them feeling confused or uncomfortable. For example, an interviewer might ask about personal matters, such as relationship status, political beliefs, or even their favorite movie, which have no relevance to the job requirements.

Another example could be when an interviewer asks strange or puzzling questions that seem unrelated to the job. These questions are often designed to assess a candidate's problem-solving skills or ability to think on their feet. For instance, an interviewer might ask, "How many ping pong balls can fit inside a school bus?" or "How would you move Mount Everest?" These types of questions can be perplexing and unexpected, leaving candidates feeling surprised or even frustrated.

While such experiences can be confusing and frustrating, it's essential to maintain composure and answer to the best of your ability. Remember, the interviewer's intention may be to assess your ability to handle unexpected situations or to gauge your creativity and critical thinking skills.

It's worth noting that these types of unconventional interview questions are becoming less common as companies focus more on behavioral and situational questions that directly relate to the job requirements. However, it's always good to be prepared for any unexpected questions that may come your way during an interview.