This is quite simple but requires couple minutes and some group co-operation (in some cases may have benefit in soloing too).
a) Pop all your cooldowns while in a city and immediately logout to char screen (use /logout macro, closing wow doesn't work)
b) Wait until your CDs are ready again, like 2-3 mins, and then log back in
c) Get summoned in front of boss and you can start the fight with extended buff durations, >1 minute Metamorphosis if you're a demo warlock, etc.
- can be used also to use several different potions at the same time
- long duration buffs like Metamorphosis might work even if you logout inside instance, but then you'll lose more than 20 sec from them
- if you're doing this you may want to grab couple extra buffs too like Curse of the shattered hand and Feltaint
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