There’s a scene at the Lincoln Memorial in the movie Forrest Gump. It’s the one where Forrest and Jenny run through the reflecting pool to embrace. Here’s a still:

Unbelievably, on my 1993 trip to DC I came upon what remained of the shoot. I didn’t know what movie it was for at the time, of course. But I did photograph enough of the scene to prove now that it was Forrest Gump. Check the TV truck in the lower right of the photo above. It’s in my photo below, lower left.

It sports a logo of WTOP-TV, an actual Washington, DC, television station (that has since changed call letters to WUSA). It’s a period-correct logo. Here is a video of an ID and the opening minutes of a newscast from this period:
On the ground that summer day in 1993, I wondered why a television station would use such an old truck. And then I noticed the construction debris, and wondered if I’d wandered onto a set being struck.

It was exciting to see Forrest Gump in the theater and realize I’d missed this scene’s filming by probably only a couple of days.