Watch the above first
The last time I almost laughed was a patient who was in his 50s, a rather unattractive man that made Cliff Claven look like a hunk (and ironically the guy was too a postal worker) was manic, parked his car in the middle of a crime ridden neighborhood, opened his doors, kept the car running, and blasted music while dancing sexually. The locals yelled at him to leave (trying to help him) because they knew he was out of place and yelled things such as "White guy get out of here!"
After him being there for 20 minutes, his car blocking the road, some kids went into his car and stole it. The police came by and dropped him in our PES. I asked the guy what he was doing and he told me he had the power to seduce any "Black woman I want" while talking (or more like attemping) to talk ghetto, and I asked him what made him think he had this power. He started dancing sexually, gyrating his hips, while his belly fat going through his t-shirt flopped up and down.
Whenever such things happen I do feel bad afterwards because the guy's car was stolen, I don't think he'd get reimbursed by his car insurance (most have a rule that if you left the keys in the car you don't get reimbursed), and his mania was destructive upon him.
But I also reminded myself I'm human and if a resident almost laughed, I would've congratulated them for not laughing. What ended up happening was I was about to laugh, it got up to a smile and then I intentionally coughed to wipe the expression off my face, walked out of the room for a few minutes to compose myself and walked back in.
The time before that, a guy was in court, and his lawyer, known for court theatrics, was arguing that I was being unfair and unjust in holding the guy against his will. I went to the the stand, told the court the guy was psychotic and lacked capacity and that he refused a PPD test and CXR so I was concerned he had tuberculosis, and that I needed the court to allow me to force the labs.
Within a second, the defending lawyer heard it he immediately looked at his client in horror, and moved his seat from right next to the guy to about 15 feet away. I was on the witness stand so I did my best not to laugh.