Breaking of the Sandal's Heel
Scholars have stated that if one sees the heel of their sandal breaking, it may indicate that their wife is not fertile. It has also been said that one might marry a woman without two witnesses. If the sandal has no thong, one might marry a woman without a guardian.
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.