Spoilers: Er, references the first few eps of season 1.

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Merlin gobbled and stammered in desperation. "And then...I mean, it was almost as if something terrible was about to happen. Like a- a foreboding. Yes, a foreboding. And then I looked up, and...there...you were." .

"There I was?" Arthur asked again.

Merlin gobbled some more. This was bad, very bad. "Well after Sophia, you know - not that it was your fault or anything because it wasn't and I know it wasn't - but, after Sophia and the dragon and the Gryphon and the Black Knight and...and..."

"You've made your point, Merlin. But none of that explains why there is a goat in my bed."

Merlin was pretty sure that Arthur smacking the table with the flat of his sword wasn't that terrifying.

"Merlin!"

OK...but it was almost scary how Arthur could make his name seem like an interrogation.

"Well, weird things happen and it was standing in your room and wearing your shirt and I thought-"

"You thought, 'poor billy goat. Let me give it Arthur's cup to quaff and dinner to eat and let me put its dirty - dirty, because have you seen what a goat walks through, Merlin? - hooves in Arthur's clean bed!' ...Is that right, Merlin?"

"I-" There really wasn't a good way to say, You think it's crazy but if you've been trying to shapeshift all day and getting nowhere, and then you walk into the Crown Prince's room and see a clothed goat baa-ing at you, it might not cross your mind that it's just the Lady Morgana up to her tricks. "I'm sorry."

"Good. Now, as your punishment, you can work out how to lay your hands on one of the Lady Morgana's dresses. I have a horse that might welcome a pretty fringe on parade."