Mamadou Sakho is making an impression at Liverpool.
He broke a fitness machine during his medical, he's been back to Paris Saint-Germain to give an emotional farewell to fans, and he's earned the nickname "Killer."
And now, as teammate Martin Skrtel tries to give a sensible interview, he's busy trolling his defensive colleague with a series of schoolboy tricks.
It's funny on the video above.
It's even better in GIF form, so you can take a look below at the best ones.
Hat-tip to 101 Great Goals for the GIFs.
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