If they wanted to keep it realistic,
Here's a list of the top grossing films of all time
. How many of them are in anything resembling physical reality? I'll grant Titanic (#2) and ignore The Passion of the Christ (#21). Other than those you have to go down to My Big Fat Greek Wedding at #74, which is still an exercise in absurdity despite respecting the laws of physics.
Come to think of it, that is kind of disturbing. Or at least ver-r-ry interesting and stupid.