Planting the Peg
Interpreters mention that whoever sees themselves planting a peg in a wall, it may indicate their love for a distinguished man. If they plant it in a house wall, it might suggest their love for a woman. If they plant it in a wooden wall, it symbolizes their love for a hypocritical young man.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam