My God, it's full of spiders...
The funniest scene for me was when they were holed up in the cabin/lodge and someone complains of the heat. The owner states the air conditioning is on full blast, which prompts Shatner's character to check the AC vent in the room.
Now keep in mind shortly before this spiders were pouring in through the fan vent in the kitchen, so when Shatner's character yanks the vent cover off the AC duct, guess what comes pouring out?