I was more worried that if I did get it all in I wouldn't have the room to manuever a chew, and in fact have to spit it out while utilizing some sort of partitioned evacuation plan. Probably involving using a finger to sort of chop the taco in my mouth into halves or quarters, and then pull each piece out.
It might have also been possible to jab the taco with a fork until it lacked the structural integrity to withstand my mighty jaws.
I also chickened out because even after repeating the dare several times I wasn't once challenged with a dollar gain, but rather looks of concern.