"Oh my God!" Mark was standing on a sink in the bathroom screaming shrilly at no one in particular.
"Mark, what the hell?" Derek came into the bathroom looking slightly puzzled.
"There it is! Look! Look! There!" Derek followed the surgeon's quivering finger as he pointed at the apparent source of his terror.
"…the toilet cubicle?"
"Nooooo! Look! There!" he screamed hysterically and tried to cower against the mirror.
"Mark," Derek said gently. "Come down from there. It is merely the remains of an experiment I performed on Meredith earlier. And yes, she is now half shrimp."
" Oh ok then. Well now would probably be a good time to tell you that I swapped little grey for a pickle with a dodgy looking hobo who lives in my trash can."
Then the shrimp made an angry sound from the sink it was swimming around in.
"What's that, Meredith?" said Derek. " You aren't at all angry? I didn't think you would be." Derek smiled mischievously and turned back to Mark. "You know, she's much more obliging now that she's a sea creature. "
Mark jumped down from his sink and threw his arms around Derek's neck, giggling.
"I wuv woo," he said, his voice muffled by Derek's awesome hair.