bonus:
Headcanon that Freya and Arthur become afterlife BFFs in Avalon, and even though they can't return to the living world, Freya can visit, as long as she doesn't leave the lake, and this is how she and Arthur learn about the modern world, including language. Particularly slang. Not all of it is exactly accurate (think Ariel and the dinglehopper) but they're learning.
Stuff left on the docks? Gone. Too close to the shore? Yoinked. Things dropped in the lake? Never recovered. She even takes stuff from boats because technically she's still in the lake.
Freya, rollerskating into Avalon wearing a beach towel like a cape and a pair of giant sunglasses, carrying a boombox and a cooler of beer: Arthur, my good bitch, you will not believe what I found this time.
Arthur, wearing a 'Sun's Out, Guns Out' tank top, jean shorts, and a huge sunhat, reading one of the three dozen trashy romance novels Freya's brought him, drinking a pina colada through a crazy straw: Oh, word?
Percival: When I said you should try being friendlier, this isn't what I meant.
Gwaine, stirring a cup of tea annoyedly: Oh, so now I'm too friendly? There's no pleasing you, Percival.
A bandit, who broke into the castle an hour ago: Two sugars, please.
Gwaine: here you are my friend
Merlin: Can I go to the movies tonight?
Gaius: What do I look like? Your dad? Do whatever the hell you want. I don't care.
Merlin: Okay--
Gaius: But be home by ten, don't talk to strangers, and remember to look both ways before crossing the street.
Merlin:
Gaius: Oh, and here, ten bucks for popcorn.
Arthur: There's something really suspicious going on here...
Arthur: There's a sorcerer in the castle... Merlin vanished, and then an old man with Merlin's eyes showed up and called me names just like Merlin does... then he disappeared and I found Merlin again
Arthur: Hold up one second!!!
Arthur: That means...
Arthur: MERLIN WENT TO THE TAVERN AGAIN!?!?!?