Do you know where the joke being used here originated?

The tsundere shark? I recall a thread that started with a mother acting tsundere towards her daughter after making her lunch for school. From there it turned to a tsundere thread, not sure when the sharks came in. Maybe it was shark week?

no, i saved the picture because its cutess damn shark i've seen.

Various manga and anime.

Can you name one in specifics that I may look up? I've recently got into animes and am looking for one to start off with

Hm...I recommend Full Metal Alchemist Brotherhood, or perhaps even Cowboy Beebop.

Though if you want an anime that makes no sense then watch Bobobobobobobobobobo.

"No sense"? Nichijou
<pic related

Point taken.