Full House (1987)

Michelle and her friends are angry at their favorite TV character "Rigby the Rhino". After seeing a commercial advertising a big, plush "action Rigby", Michelle and each of her friends order one, but instead of receiving a big, plush Rigby, they each receive a tiny plastic Rigby -- a clear case of false advertisement. Joey takes Michelle and her friends, along with their tiny plastic Rigbys, to Bayview Mall, where Rigby is making an appearance, and there is a large group of kids and their parents who are there to see Rigby. Joey, Michelle, and her friends don't want these kids to be swindled by a commercial that was a lie, so they show their tiny plastic Rigbys to these kids and warn these kids that the commercial was a lie.