Last month I been to Athens, Greece, flying TLV - ATH so as ATH - TLV with Olympic Airways B734.
On the way back I noticed something for the first time. The pilot was taxing us to the western runway, and AS HE WAS STILL TAXING the pilot pushed the engines to full power, while the 734 was not yet on the runway!
There is a 90 degrees turn between the taxiway to the runway, and I noticed (I was sitting on a window seat) the the plane moved to full throttle engines mode while still turning to the runway, not on the very end of the turn but most of the 90 degrees turn was done while the engines worked full power.
Later on, the jet was on the runway and took off immediately, without stopping on the runway.
This is the first time I saw such a thing.
(I flew on sunday night, April 22nd 2007, ATH-TLV, SX-BKB with OA as said)