..You acquire a -% delay?
A Gnome using Prowess gets -50% delay.. Combine this with Alacrity V (-25%), Rapid Fire Stance (-10%), Energize II (-15%), Boars Rage (-15%) and the Tempest(?) Banner (-7%).. They're the ones I can think of right now.. And you come to -22% total delay. However, I'm not sure if any of these conflict (I know Alac, Rapid Fire, Energize and Rage don't).
Obviously, that is not possible. I mean, how can you have a negative delay? So, I guess the question is: Which delay buff is counted first?