This is easy to do in team games, when a Terran player sends Zerg allies a few Command Centers to infest, or when a Zerg player attacks a new Terran base expansion, or also in a team game, one of the opponents is Terran, and happens to not be as good a player.
The unit in question, when acquired becomes a huge asset for the player, due to its heavily damaging suicidal attack. Tip: if you ever get to make these, make sure you know how to use them. If the enemy drops a few light infantry right next to your Infested Command Center, any Infested Terrans nearby will charge and probably destroy your precious ICC.
n00b2: fuck, which one?
*the first player's overlords drop Infested Terrans on ALL SIDES of the second player's base.*
person3: LOL, good one Phil! it was worth the minerals!
*drops Siege Tanks and Vultures next to the second player's resources*
Random Racist: Infested Terrans are just muslims brainwashed by the Zerg
2 A nigger or animal of African Descent (can't say human, niggers aren't human)
2 "RUN! There's an infested terran at this KFC!