Taxiing
The World's Slowest Jet 
at Gove the other day, we had a 4 or 5 minute delay for the preceding aircraft to backtrack RWY13 and then be ready for take off. That's life.
Just as we entered the runway, up pops bloggs (C402 I think) on MBZ and asks can he follow us down and depart as number 1.
I can only assume that Bloggs didn't want to wait his turn, given that he asked us to allow him to depart as #1.
My question is, if he didn't want to wait his turn, why would he think we'd want to wait longer than required for our turn? Not to mention that at a guess his climb speed would have been about 120 KIAS, our V2 about 130 KIAS increasing to 250 KIAS, thus requiring a wait until AIP separation standard was met!