The Goonies (1985) Blooper Mama slaps Francis (Joe Pantoliano can't help but laugh on camera)

In the scene in the basement of the Lighthouse Lounge where Mama, Francis and Jake are discovering that someone has been in the basement while they were gone. Mama slaps Jake and while she swings her arm, it catches Francis' headphone wires and you can see that Joe Pantoliano can't help but laugh breifly before re-composing himself. Richard Donner apparently didn't notice or didn't feel that the audience would notice and left it in the movie. I didn't notice it till 20 years later.