Alright, so here's how this works:
You order an ice cream cone at a drive thru. Preferably soft serve. When the server leans out to hand it to you, grab the top of the ice cream. Grab fearlessly and with confidence. Maybe even smash the ice cream a little in your hand so it oozes between your fingers.
Before you drive away, take a bite out of the cone (the essence of coning). Since you're holding the ice cream cone upside down, this part is really simple.
You have to be completely committed to the grab. If you're a pansy when you take your soft serve, the effect is lost.
As an alternative, you might consider not doing this at all.