Woody says the line “There’s a snake in my boot!” in Toy Story.
The phrase is one of Woody's prerecorded pull-string sayings and reflects his cowboy-themed design. It is intentionally silly: Woody is a toy with a voice box, so the line is a fixed part of his speech rather than a spontaneous observation about a real snake.
Woody's other voice-box phrases include Western-style commands such as “Reach for the sky!” The sayings help identify him as a pull-string cowboy doll and distinguish him from Buzz Lightyear, whose language initially comes from his imagined space-ranger mission.
The quote is sometimes incorrectly attributed to Buzz because both characters are strongly associated with Toy Story. In the films, Woody's cowboy voice mechanism and costume make the line part of his character identity.