GM: “You… um, succeed in smashing out enough bricks in the wall to make an opening.”
Player: “We look through the hole! What do we see?”
GM: “I… don’t. know.”

Yeah. I feel like improvisation is a necessary GM skill.

The basic premise was that the PCs were trapped in a prison cell because of a robbery one of them had committed. I (crudely) described the cell, and asked what they’d do. My first surprise was that they didn’t try to pick the lock on the door, as I’d expected, but they came up with elaborate plans, like waiting for something one-shottable to come along, so the Warlock could curse it, kill it and teleport (Fey pact boon) through the door.
The second came after they’d gotten out of the cell complex and into another room with a few guards. Instead of immediately attacking them as I expected them to do, they tried to persuade the guards that they somehow gotten in there. Luckily for me, he failed his bluff check.
The third was when they’d eventually killed the guards and were getting ready to leave the building. Instead of using the door like a sane person would, the party figured that since they’d just been in a fight, their clothes would be all bloodied and stuff which would make them a prime target for other guards. So they decided that the 20 strenght fighter would use a sledgehammer to smash a hole through the wall into unmapped territory…