Just Think of Blue Stop Signs

[Mettaton's eyes practically sparkle when Sans pulls out Moulin Rouge.]

Darling, there's no way you could have known, but I absolutely adore that movie!

[He looks at it fondly, chuckling.]

I adored this movie before I came to Wonderland, but this is the movie that led to me meeting Max, so now I am extra fond.

[Fun date movies. He's glad the closet didn't toss out anything potentially risque for a "date night".]

Oh the bed should be just fine. No need to trouble the closets any more than necessary!

[That sounded casual, right? Just wanting to be on the bed for snuggling. Nothing more than that. Haha. He's not... thinking of that at all.

He makes himself walk over and plop down on the bed, stretching out and then perching on his side to smile at Sans.]

I don't know if you wanted to pick a specific one to go first, but my vote is for Moulin Rouge.