some skills can make some skills from your bar to recharge...
Signet of Humility = Target foe's Elite Skill is disabled for 1...13 seconds.
Power Block = If target foe is casting a Spell, that Spell is interrupted. The interrupted Spell and all Spells of the same attribute are disabled for 3...13 seconds for that foe.
Blackout = For 2...5 seconds, all of touched target foe's skills are disabled, and all of your skills are disabled for 5 seconds.
... and ...
Archer's Signet = All your non-attack skills are disabled for 15...9 seconds. For 30 seconds, your next 1...6 bow attacks cost no Energy.
Tiger's Fury = All your non-attack skills are disabled for 5 seconds. For 5...10 seconds, you attack 25% faster
For more read
http://gw.gamewikis.org/wiki/Recharge#Related_Skills