Oh, this one hits close to home (Yours truly holds a PhD in biochemistry and molecular biology) but it's too good not to share. Watch (and weep, if you're a grad student) Grad School Pressure, a parody of Flight of the Conchords' Inner City Pressure, as performed at UC Berkeley MCB Follies, by actual grad school student Nathaniel Krefman and friends.
Love that? How about this one: Some Budding Yeast I Used to Grow, a parody of Gotye.
[YouTube Clip - via metafilter]