In Equoid there is a passage about tea. Let me quote:
She gives the tea another violent stir, then sloshes a stream of orange-brown liquor into the mugs—one of those breakfast blends with more caffeine than espresso and a worrying tendency to corrode stainless steel—and shoves them at Greg and myself. (Americans think we Brits drink tea because we’re polite and genteel or something, whereas we really drink it because it’s a stimulant and it’s hot enough to sterilize cholera bacteria.) I accept the mug with some trepidation, but it doesn’t smell of sheep-dip and my protective ward doesn’t sting me, so it’s probably not a lethal dose.
I drink LOTS of tea but I’m no expert. However, the “more caffeine than espresso” and “corrodes stainless steel” makes me think of the excellent Bewley’s Irish Breakfast.
The only thing I can think of that will wake you up faster is licking a wall outlet, and that is only in the case of 1) 230 Volts and 2) lots of old-school metal fillings in your teeth.
This stuff is great for those low-energy mornings when you need something to kick-start the day. It may lead to unsightly vibrations and general muscle spasms but you will be upright and doing a fair imitation of life.