Next time for a sure fire hit at what you wanted..
Next time use voice actors, Use a faster FPS so the movements like the blinks dont seem longer than they should be, take a little longer to frame by frame animate, Have them get a little closer to acting like their thinking about having sex or whatever. so its even more funny at the end. Maybe add some colors and since it doesn't require too much movement i recommend you find a drawing tutorial and draw them as anime characters, also dont make one of them look like nerd or it'll be like "Wait wut?" also you probably are going to want to have a scene where one of them like puts down the phone gets in the car and drives over, like a cool credits start up... but that's kind of hard at your level so just have it shows them walking up to the door with a bag in their hands and ring the doorbell
Trust me, more storyline and voice actors will really help, ask around the NG BBS