This is best accomplished by consuming LARGE quantities of beer, as beer seems to give a consistently larger volume of foam per regurgitation.
To increase the foaminess, it is reccommended that you do anything active just before you're about to start the foam party... some examples include: hedge diving, cart-wheels, or jumping-jacks.
Bryce - oh shit... it must be from that foam party we had in the parking lot last night!
Ashley - Nice...
Well my boyfriend is working away this weekend so I've planned a foam party wank marathon. I'm going to flick my bean so fucking hard my juice is going to soak the carpet through. Care to join in?