I was DMing for my teenager and his friends. There were 9 of them, and they lived for combat. We ended one session with the sacking of a frontier town.
The next session was rounding up the townsfolk for slavery, searching all the houses for valuables, burning the town, escorting the slaves to market, selling them, and returning to the frontier. That took a few hours (nothing is efficient with 9 teens), and I was ready to call it a night. One of the boys said, "it's not D&D if there's no combat!" and all the rest agreed. Sooooooo......
"Orcs jump out of the bushes and attack you!" Thus begins the most one-sided rolling session I've ever seen. PCs are between 3rd and 5th level. No one makes a spot check, so the orcs surprise and toss some javelins. The wizard PC (a munchkin if ever there was one) claims he has his Pro vs Arrows spell up. So I roll off against him, he wins, and I let him have his spell running. So the barbarian takes a couple points of damage and the wizard doesn't. So the wizard stands in front of the barbarian (protecting him?!?) and taunts the orcs. Who draw greataxes and charge from all directions. First charge critical hit on wizard, DEAD. Critical hit on Fighter, DEAD. Not down, but under -10, dead dead dead.
No PC can hit. No orc can miss. Soon these 10 orcs have 2 dead PCs, 2 downed PCs, two PCs with single digit hp, and haven't taken a point of damage. Priest of Kossuth steps back and casts Burning Hands on one side of the battlefield. Half the orcs die. Players are shocked. "These are regular orcs?!?" Evil grin, "yup."
The law of averages asserts itself, and most of the other orcs go down. Last two run away. Barbarian chases one, monk chases the other. Both PCs try to grapple. Both orcs crit with the AoO. Monk goes down, barbarian is in single digit hp, and that's only because of rage. Last orcs run away.
In the end, 6 PCs down, 2 dead, a total of about 12 hps in the whole party. And we hand out XP! 75 each.
But it was a real D&D session!
PS