I've had a few undercooked/barely cooked meals from finishing off a bag of charcoal without starting a new one and being short on fuel for the duration of the cook. The real screwups have been with the WSM though.
On one occasion, I had ribs cooking in the WSM and it was after dark so I had a clamp lamp attached to the fence shining down on it with a good, old fashioned, energy wasting, politically incorrect General Electric 100 watt incandescent bulb in it. I had a friend visiting from out of town and we were putting sauce on the ribs when it started to rain and the rain was coming down in big, huge drops. The thermal shock of the rain landing on that hot lightbulb shattered the glass and it exploded and rained glass down onto the ribs. We ended up brushing the glass off and re-saucing the ribs and we got all that pretty much finished when the light went out. Both of us were surprised how long that bulb's filament hung in making light while it was exposed to air before it finally burnt open. To date, I've never had a GE rough service bulb burn out, just a couple of breakage victims. I'd keep buying them if they were still available.
Another time, the WSM was going full bore with a load of ribs and they were taking a long time. The water level in the pan was getting lower than I'd like so I opened the side door and tried to fill it using the garden hose instead of a water jug. The idea was to use the valve on the nozzle to fill at a reasonable rate but it was a bit touchy and went from off to full on with very little movement and it opened with a vengeance. The water pan filled and it sloshed everywhere and snuffed out a good portion of the fire. Rescuing those ribs took some doing with vents wide open, hurridly lighting some lump charcoal and tossing that in, and waiting even longer for the ribs to finish up.