This is done best at level 6 for obvious reasons.
Basically... Have Thresh throw down a lanter next to blitz and walk to the turret.
Blitz uses his grab and clicks the lantern directly after clicking grab.
Blitz' arm gains a ridiculous pull length... pulling the enemy to the turret.
Silence the enemy and knock him up... and if that doesn't kill him.. have thresh use his pull to get him back in turret range.
Enjoy the luls