It's the call of nature that has created a wee problem for Wimbledon officials.
In bizarre scenes during a marathon third-round doubles match, Pablo Cuevas earned a code violation for unsportsmanlike conduct with the fifth set in the balance at 9-8.
Cuevas reportedly threatened to urinate into a ball can after being denied a bathroom break.
Wimbledon officials insist Cuevas did not follow through on the courtside threat despite a witness claiming the Uruguayan did urinate into a ball can hidden by a towel.
In a match marred by bad-tempered behaviour against Britain's Jonny Marray and Adil Shamasdin of Canada, Cuevas and his playing partner Marcel Granollers staged a sit-down protest.