I saw this movie years back (for some reason "the Ewoks" keeps ringing up) . Anyhow, it had this scene
of a kid that fell either through ice or in a pool, and when he tried to come up for air, there was a glass like
sheet over the water that wouldnt let him surface or breathe. I think there's a similar scene in "The Dead Zone"
but that's not the one I'm thinking.
A couple of names come to mind. There's a scene like that in The Good Son with a little girl ice skating and when she tries to come up she's stuck under the ice. Also in The Legacy there's a scene with a swimming pool where a woman (I think, haven't seen it in a long time) is trapped in a swimming pool and there's a glass cover over the top and she drowns.