[Fedora]

I'm driving near a lake, and the road keeps getting nearer and nearer to the water, until eventually the road is covered by water and disappears... variations include driving on a road in the country which eventually turns into a trail and then disappears, or driving on a road under construction and suddenly realizing the construction isn't finished (usually as my car flies off the end of the uncompleted overpass...)

I think that last one happened in The Blues Brothers :)

I have ones that are kinda similar in theme to this, though the imagery is different, where I'm trying to follow a bunch of secret passages through a house but eventually the passages get so narrow I can't move.

[TalonDJ]

but eventually the passages get so narrow I can't move.

Sometimes I have one like that if I sleep in a tight spot like a sleeping bag.

[300winmag]

I think that last one happened in The Blues Brothers :)

Ah yes, "The Blues Brothers", another favorite of mine.

Another under-appreciated movie is "Silver Streak" with Gene Wilder and Richard Pryor. Forget everyone else in it, their comic interaction makes the movie. That, and the nice Henry Mancini score. And one absolutely gorgeous scene of their stolen Jag XKE taking a sweeping curve at dawn in the middle of endless farm country with Mancini's score fitting in perfectly.

And I'd be remiss by not mentioning "Ruthless People" and "Trading Places".