Something like this happened to me a long time ago too. I can't give the exact details because the incident would be recognizable and I need to preserve my anonymity. However, basically I wanted person X to do Y, and X absolutely did not want to do Y. So I prayed something like "God, unless you tell X explicitly to do Y, they're not going to do it, please tell them to do it."

The next day a total stranger (to both of us) came up to X and told them they had a message from God for them and that they should do Y.