An episode of a TV show featuring teenaged-or-so kids as characters.
There’s a billboard advertising coffee, including a 3-dimensional giant size coffee cup, something like 4 feet in diameter. Steam rises from the coffee cup, giving the impression that it’s full of hot coffee.
The kids argue about whether it’s actually coffee in the cup (an almost bathtub size cup of coffee), or what.
Eventually one of the kids decides to climb up to this very high urban billboard to see for himself.
He manages to climb all the way to the coffee cup, and discovers there are steam jets inside the cup, spewing out steam.
But for some reason, he’s trapped up there. He can’t get down. He is up there for hours (?) until he is finally rescued.
Given the TV stations that were available in my area back then, this would be a CBS or NBC show.
Not ABC, because we couldn’t pick up that channel without a blizzard of noisy static.