This can be for any game. For those who have GM'd, what are some of the more memorable ways that your players have surprised you, that you can remember.
One of the ways I have been, in my limited GMing experience, is when I was running the D&D bought campaign where the players are in a magical pyramid(I don't remember the exact name but it is 4e). One player was a druid and another a battle mage I guess you can say. They had the druid summon as many rhinos as she could and just have them plow through the level they were on knocking open/down all doors while the spellcaster cast the spell to summon lots of eyes to scout. This way obviously they could see what is to come on the level. Of course, the NPCs know something is going on.
One of the ways I have been, in my limited GMing experience, is when I was running the D&D bought campaign where the players are in a magical pyramid(I don't remember the exact name but it is 4e). One player was a druid and another a battle mage I guess you can say. They had the druid summon as many rhinos as she could and just have them plow through the level they were on knocking open/down all doors while the spellcaster cast the spell to summon lots of eyes to scout. This way obviously they could see what is to come on the level. Of course, the NPCs know something is going on.