"When researchers sampled playgrounds, they found blood, mucus, saliva and urine," reports Today.com. And we're not just talking about outdoor playgrounds. In 2011, mother Erin Carr-Jordan spent thousands of her own dollars to collected samples from the indoor play areas of nine fast food restaurants in seven states. The lab found fecal matter – human waste – in nearly 90 percent of the samples. Ball pits are even worse.

In 2008, British microbiologist James Francis took a swab to 33 keyboards in a typical UK office and compared them to a toilet seat and a toilet door handle at the publication's London office in January. "He found that four of the keyboards tested were potential health hazards -- and one had levels of germs five times higher than that found on the toilet seat," reported ABC.

Cancer isn't the only way a tanning bed can kill you. Dermatologists have determined that these bed can also be a hotbed for the life-threatening staphylococcus bacteria, as well as fecal bacteria, the herpes virus, and papillomavirus, which causes warts.

In 2013, "CDC researchers collected water samples from filters at 160 public pools, booth indoor and outdoor, located in the metro-Atlanta area. They found 'poop' in nearly 60 percent of the pools, with tests revealing 58 percent of the water samples were positive for the bacteria Escherichia coli, or E. coli," reported CBS.

A 2010 report from the International Journal of Food Microbiology found traces of coliform bacteria on various soda fountains in the United States. Coliform is a form of bacteria found in fecal matter. The soda fountains were also found to have traces of other bacteria that could lead to staph infections or gastric issues. Just think twice before using a soda fountain at a highway rest-stop.

The news program 20/20 recently swabbed several theaters in New York and Los Angeles, then sent the samples to New York University Professor of Microbiology, Phillip M. Tierno, to analyze. He found evidence of bacteria found in cattle and soil, as well as bacteria commonly found in human feces and yeast.

When researchers at the University of Arizona swabbed the handles of 85 carts in four states looking for bacterial contamination, they weren't disappointed. They found that  72 percent of the carts had a positive marker for fecal matter, and 50 percent had E. coli.

“We did a survey collecting 1,000 sponges and dishcloths in kitchens, and about 10 percent had salmonella," Dr. Gerba also told Food & Wine. "They get wet and stay moist, so bacteria grow like crazy. The most E. coli and other fecal-based bacteria in the average home are on a sponge or cleaning cloth."

We all know currency is filthy, but what about the credit and debit cards sitting in your wallet? A researcher at the University of London found 47 percent of the credit cards tested sported high levels of bacteria — including E.coli and Staphylococcus aureus — as opposed to 26 percent of the banknotes.

"About 81 percent of hotel room surfaces sampled held at least some fecal bacteria. And television remotes are, in fact, among the most bacteria-laden surfaces, ranking up there with toilets and bathroom sinks," reports Scientific American.