You might not feel sick, but I'm afraid that's one of the symptoms! There's a bug going around, very timey wimey, messes with your memories but makes you feel perfectly fine and why on Earth didn't I bring the sonic sunglasses, you were supposed to remind me about them!

[ The Doctor turns to look at Murray the possum who, having jumped off the Doctor's shoulder when he started running, is now bounding up the stairs behind Enid and the Doctor.

It's gonna get pretty weird pretty fast, Rick. ]