The hiccups are easily the most annoying involuntary bodily function.
Forget eye twitches, farts and burps -- hiccups take the cake, and always seem to hit at the most inconvenient moments.
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Humans aren't the only ones who have to endure the annoyance of diaphragm spasms. Many animals also get the hiccups, and unfortunately for them, they're unable to cure them by drinking water upside down or through a straw like us.
Despite how aggravating hiccups may be, it's absolutely adorable when animals have them.