Legolas/Aragorn in...
The Fellowship of the Ring:
    ~ Legolas defending Aragorn at the Council of Elrond.
    ~ When the watcher destroys the Moria Gate, Legolas hide's behind Aragorn while clinging to his shoulders in fear.
    ~ While they are going down the stairs to the Bridge of Kazad-Dum, when Aragorn and Frodo fall, Aragorn falls straight into Legolas' arms.
    ~ When Legolas says "A shadow and a threat have been growing on my mind..." Aragorn caresses his shoulder and trails his hand down Legolas' back.

The Two Towers:
    ~ The look on Legolas' face after Aragorn falls off the cliff.
    ~ The moment when Aragorn returns to Helms Deep after everyone thinks he's dead.
    ~ Legolas is worried about Aragorn after he returns to Helms Deep.
    ~ Before the battle of Helms Deep, Aragorn and Legolas get dressed in the same room, but Gimli in another.
    ~ Legolas saves Aragorn  (and Gimli) at Helms Deep, when they are buying Theoden time to fix the door.

The Return of the King:
    ~ When they are talking about Sauron outside the Meduseld.
    ~ When Aragorn takes the Palantir from Pippin he falls down, and Legolas falls on top of him for no apparent reason.
    ~ Going into the Paths of the Dead, Legolas follows Aragorn like a lemming.
    ~ The look on Legolas' face when Aragorn is being stepped on by that troll during the battle at the Black Gate.
    ~ Aragorn's Coronation (He does not see Arwen and go "wow, oh my god, she's here, now we can get married!" he goes "oh crap, what the hell is she doing here? She's supposed to be gone so I can marry Legolas, damn her.")
    ~ Also at Aragorn's Coronation, Legolas has shifty (almost flirty) eyes when Aragorn says 'Hannon lle'.