Note:
Actual words Sakurai-san is saying in the last gif is 「ワシじゃー！」(Washi jaaa!).
As you may know, there are dozens of pronouns in Japanese (if you’re interested, check wiki page).
Sakurai-san’s choice of pronoun here makes him sound like he is a stereotypical grandpa, so his comment is quite funny in Japanese.
Carry Dawn 