The snails were left behind at a hotel in Budapest while a startled guest in a hotel in Washington DC found a snake in his room, according to a survey conducted by the travel company lastminute.com.
The left-behind spouse was at a hotel in Prague when a businessman went straight to the airport leaving his wife at the hotel.
A guest staying in a hotel in Dublin forgot his mother was with him and left without her.
Other instances included $10,000 left hidden around a hotel room in Washington DC, a dog left behind by an owner in a hotel in Milan, a police officer leaving his gun and badge in a Las Vegas hotel and wedding dress left behind in a New York hotel.
Kathy Dover, head of brand and public relations for lastminute.com UK and Ireland, said: “It comes as no surprise that hotel guests sometimes forget to pack all of their belongings; however we were incredibly surprised by some of the items left behind.”