Hello. I’m trying to remember the name of a movie I watched years ago. It follows a group of newly graduated college students to a reunion years later in the beach. In particular, I remember a scene where they go to the roof and sing, and one of them is wearing a rat/mouse costume. The song “I’m Not In Love” by 10cc is included. Thank you!
farcry Edited comment

If it doesn’t get identified you might want to look at this:
https://www.imdb.com/name/nm1444910/?ref_=nv_sr_srsg_0#soundtrack
You just have to search for “I’m Not in Love” on the page using your browser (Ctrl+F in Firefox) and go through the results (38).