If there's something you really need to tell someone, don't waste time telling them there's something you really need to tell them. Just tell them! Those few seconds could lead to a catastrophic explosion, or a dam bursting, or huge crash.
Or something much, much worse. Yuk!
Leia: Luuuke! Duuude! You made it!
Lando: Take care of him. I gotta see what Chewie's doing to my ship.
Leia: I totally love you, man!
Luke: Princess, there's shomething I really need to tell you.
Leia: I know!
Luke: Bleah! Wait! No! Too late!
Leia: What did I do?!
Luke: You kissed your own brother!
Leia: No way! When?!