The 'The Trees Speak in Vietnamese' meme is a popular internet trope that references the guerrilla warfare tactics used by the Viet Cong during the Vietnam War. It often features images of the Lorax, a character from Dr. Seuss, or soldiers looking terrified at a dense forest, suggesting that the environment itself is hiding enemies. The meme gained significant traction on platforms like Reddit and 4chan in the late 2010s as part of a larger trend of historical 'Vietnam Flashback' humor. It is typically used to convey a sense of sudden, overwhelming realization or paranoia in seemingly normal situations, personifying nature as an unexpected threat.