I still prefer the music video treatment I daydreamed in my head:
When I listened to the song, I imagined the video was prom-themed. It would start with Becky dancing around her bathroom before she had a shower, with her iPod/earphones in, dancing in front of her mirror like a goofball (which I know we all do).
Then, right as she's walking to school, her boyfriend or the boy she likes pulls off this really elaborate, massive, really cute Prom Proposal to her in front of the school with everyone watching.
Then, it's prom night, and the theme is "movie couples" and Becky and this boy go as Romeo and Juliet from Baz Luhrmann's Romeo + Juliet. And they dress up as Leo's knight and Claire Danes' Angel.
Everyone's dancing where the prom's being held in the basketball court. And then right as the final chorus is building up at 2:10 of the song (
"there ain't no guarantee, but I'll take a chance on we, baby let's take our time") everyone runs out of the auditorium and onto the football field and starts dancing. Becky looks up and it starts raining all over the football field while everyone's dancing and she's singing to Shower.
Then right at 2:50 when the final chorus comes crashing in, her boyfriend leans in and kisses her in the rain.
Everyone continues to dance in the rain. The camera even cuts to a Mary Jane/Spiderman couple, who've lifted up his mouth-piece so that they can kiss in the rain as well and repeat the infamous Spiderman kiss (except not upside down)
The end