It's just several weeks ago a LX
A320 bound from ZRH
to Moscow returned to the gate as a small red snake came out of the pocket of a passenger and disappeared under the seats. Some passengers observed this and for sure informed the crew immediately. The plane was offloaded. As they did not find the snake after a while, another plane was scheduled to Moscow and the flight left with some 2 hours delay.
The passenger - who's pocket the snake came from - was Russia and connected trough ZRH
back home, coming from a long range flight. Obviously the snake was in his pocket the whole long range flight...... real nice feeling, having this guy in the same plane, maybe just aside.... Anyhow, he stated that this snake was not poisonous.
The plane was smoked out with a deadly gas the other day as the snake wasn't found.