buy the laptop, boot it up, put the banana phone song on it, open the song in a program that supports repeat, set it to repeat, push play, and then run around the house playing the song. See how many people you can annoy.
And for bonus, repeat the above procedure in a public library, and see how long it takes to get kicked out.
Extra bonus: turn the volume up to max, and then sneak up behind someone sitting on a park bench at the park, and push play.
Ok, they aren't good reasons, but hey, they give you something to do for awhile, and you get to annoy people in the process.