I know I've seen this before.

Regardless, I envy their relationship, and found that slowly-dawning realization of the brother over the course of the video hilarious.

*nsfw *happy

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She has to do a bunch of selfies as well. Its the only explanation.

Gullible Gus

*love

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i dont get it,,,,,,some one explain why this is funny please.

Aww, that's cute.

@robdot - It's funny because it's a running gag that elicits such a viscerally humorous reaction while exhibiting a sweet sibling relationship.

If it was just done once, it wouldn't be as entertaining, but she does it to him repeatedly over apparently a long expanse of time and she keeps eyeballing him when she does it before he finally realizes she's done it again. It's fun watching that realization happen, especially because of his subsequent reaction.

..or maybe he has that "Memento" condition, and all these happened on the same day.