Pranks are always funny until people start calling the authorities.

A woman in the United Kingdom made a frantic call to the RSPCA when she found an alligator in her bathtub. Unfortunately for her, she was actually the victim of a trick played by her family.

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Clare Kelly was the victim of a prank played by her brother and mother. (SWNS)

According to Southwest News Service (SWNS), 25-year-old Clare Kelly says that she believed her brother when he said “he’d found this baby alligator in a bush in Rhyl. My mother was in on the prank too.”

She explained to SWNS, “They were so convincing, that I genuinely thought it was real and was planning on how to look after him. I was ready to help the alligator - and we’d even discussed getting some meat from the butchers to feed him, and how I’d keep my hamster safe who lives with us.”

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It turns out, Kelly’s family didn’t realize how seriously she was taking the situation and that she planned on calling the RSPCA.

"It wasn’t until I told my family I’d called that they burst out laughing,” she said, “and I had to then tell the RSPCA this alligator was actually made of plastic!”

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“As soon as this call came in, it seemed highly unlikely to be true,” RSPCA Inspector Andrew Broadbent told SWNS.

“It’s important to never rule anything out in the animal welfare world,” he explained, “but there aren’t too many alligators lurking in the bushes in Rhyl! The poor caller had been tricked by family members, who had put a toy alligator in the bath and pretended they collected it from nearby bushes. She was only trying to help - and was very apologetic.”

Fortunately, it turns out the RSPCA was understanding about the situation.

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Broadbent said, "Our chat certainly offered a bit of light relief at a difficult time for everybody at the moment, amid the coronavirus pandemic. We do sometimes get calls where people mistake toys or other objects for animals. My colleagues have previously rushed to the aid of a rubber scorpion, a cuddly dog stuck on a roof, or a squirrel mistaken for a cat up a tree!”

However, he did conclude by saying, "But this was certainly a new one on me!”