Man finds meth pills at the bottom of his milkshake.

Nothing worse than a meth-flavoured milkshake.

An American man is suing an In-N-Out Burger restaurant for spiking his milkshake with meth-amphetamines.

Fred Maldonado filed the lawsuit in California on Wednesday for negligence and strict liability. He claims that he bought a burger and milkshake from the drive-thru in March 2014, and then took it back to his hotel room. He ate the burger and drank half the drink.

The next morning, Fred finished the drink, and allegedly found two blue capsules and a napkin at the bottom of his cup.

He returned to the restaurant, showed the manager, and got a free burger. Pretty good deal. But Fred wasn’t satisfied.

Man allegedly finds meth at bottom of his In-N-Out drink http://t.co/4inbq48W4K pic.twitter.com/Eqz9JYNnVu

— NBC Los Angeles (@NBCLA) August 2, 2015

He took the pills to be tested at the Utica Toxicology Service, where they were proven to methamphetamines.

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According to Fred’s lawyer, Fred did not ingest the pills but did suffer nausea and mental distress as a result of consuming the drink.

In-N-Out has denied the allegations. “At In-N-Out Burger, we have always served the freshest, highest quality burgers, fries, and drinks and customer safety is one of our highest priorities. We will vigorously defend these baseless claims.”