animated bill_(left_4_dead) blood bodily_fluids boomer_(left_4_dead) digital_media_(artwork) drugs female first_aid_kit flash francis_(left_4_dead) genital_fluids green_flu_mutant_(left_4_dead) group human humanoid humor hunter_(left_4_dead) johnathan-wrathborne left_4_dead_(series) louis_(left_4_dead) male mammal medical_instrument molotov_cocktail monster monstrous_humanoid newgrounds not_furry parody peeing scientific_instrument sound tank_(left_4_dead) undead urine valve valve_corporation watersports weapon witch_(left_4_dead) zoey_(left_4_dead) zombie
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