Introduction Various cases of self-inflicted foreign bodies in the male urethra have been reported. Most of them are associated with autoerotic stimulation, psychiatric disorders or intoxication. Case presentation We report the first case of a patient who put an Allen key completely in his urethra. The patient presented with dysuria, haematuria and penile pain. Conclusion A self-inflicted urethral foreign body is a rare situation. Endoscopic removal is the recommended first-line treatment and if unsuccessful, open procedures may be necessary.