Driving the Wooden Peg
Interpreters believe that if someone sees a young man driving a wooden peg into their back, it may indicate that they will have a hypocritical son who will be an enemy to them. This interpretation points to offspring who may bring enmity or hypocrisy.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam
Note: These are traditional scholarly interpretations (ijtihad) drawn from a specific classical source — not a binding religious ruling, fortune-telling, or a prediction of the future.