Everyone of these have the same thing in common. I'll let you know what it is by updating this once someone figures it out. If you have figure it out, which one used it the best?
The list: http://www.imdb.com/list/ls027556518/...
Okey since no has gotten the answer to this, the answer is that one has a character ether wearing or using merchandise based on an actual comic book superhero, particularly Marvel Comics or D.C. Comics.
"Adventures in Babysitting" (1987) - one of the kids, Sara, draws pictures of Marvel Comics Thor, she wears a plastic Thor Helmit throughout the film. At one point she offers the helmet as trade for a five dollar shortage for replacing a car tire.
In "The Fifth Wave", one of the kids has a Spider-Man doll that was used as bait for a booby trap in a training exercise.
In "Unaccompanied Minors" Beef has an Aquaman action figure (a.k.a. doll) that he uses to trade for a Christmas tree.
In "Fred Claus", Clyde receives a Superman cape from Santa Claus that changes him from being a bad guy to a nicer man. At the end of the movie, Clyde wears the cape under his clothing.
In "The Big Bang Theory' Sheldon constantly wears T-shirts with the Green Lantern or the Flash symbols on them. Around Sheldon and Leonard's apartment , there are Superman and Batman models or figurines. One episode has the cast dressing up as comic book super heros. And countless many more since one of the main sets used on the show is a comic book store.