CK+AA at lvl 2, stun, cold feet, rift back into cold feet for proc. Anything that can almost guarantee AA cold feet will generally result in a kill, I believe you can use dispersion too to force proc it at lvl 1 but not entirely sure and would be a weird lane kinda.
Earthshaker fissure cross lane, with good positionning it'll be a sure kill.
Double neutral enchantress gank, can do it at like 1min and 2 neutrals at that level will rape people so fucking hard with any type of disable.
Ursa+any strong disabling hero, especially double disables like Lion or Rhasta.
Gyro with rocket barrage at any level before 6 basically, as long as you can run them down. Pudge with the same type of strat, Rot and run them down with a hook for additional dmg if you can't make it.
Bane as a setup for certain things, for example Bane+Mirana, sleep into long range arrow. Same can be done with clockwerk and furion(less efficient due to tangos early game).
Enigma gank with full eidolon.
The most common FB "strat" though are generally juggernaut ones, it's so easy to setup with basically any support almost, and especially double disables or long slows like veno, CM, Lion, Rhasta. Buy boots first on jugger, get pooled a bit of regen, go safelane and if the enemy isn't in a safe spot they're most likely dead. Other than that, there's also half the mid heroes when they hit 6.