multiple personality disorder; couldn't remember some things; having an angry outburst; Some things he was saying, he seemed to be confused like he didn't know where he was; disoriented; talking like he wasn't himself; This is a spontaneous report from a contactable consumer or other non-healthcare professional. A 16-years-old male patient received bnt162b2 (BNT162B2, Pfizer Covid-19 Vaccine, Solution for injection), dose 1 via an unspecified route of administration, administered in Arm Left on 22Jul2021 (Batch/Lot Number: FA7484, Expiry date was not reported) (at the age of 16-years-old) as DOSE 1, SINGLE for covid-19 immunization. Medical history included epilepsy and asthma (she reports when her son was younger, he had epilepsy, but he outgrew that and hasn't had a seizure in several years. He also has asthma). There were no concomitant medications. It was reported that at the end of Jun2021 he received a vaccine, it was the DTaP vaccine, but she was not sure. There were no adverse events reported prior to vaccination. On 24Jul2021, the patient experienced talking like he wasn't himself, some things he was saying, he seemed to be confused like he didn't know where he was and disoriented. On 25Jul2021, the patient experienced having an angry outburst. On 26Jul2021, the patient experienced couldn't remember some things. On an unspecified date, She said that it's like her son has multiple personality disorder. The mother called because she wanted to report symptoms that her son was having after receiving the Covid 19 vaccine. She stated that her son received first dose of the Pfizer Covid19 vaccine last Thursday, 22Jul2021 and was scheduled to get the second dose on 12Aug2021. However, the caller mentioned her son experienced side effects. On Saturday, 24Jul2021 her son was talking like he wasn't himself. He ended up having an angry outburst. Some things he was saying, he seemed to be confused like he didn't know where he was. He was disoriented. The agent is transferring the caller; she is not in any Pfizer program. She confirmed the details provided by the transferring agent. She reported that it was Sunday, 25Jul2021 that her son had the angry outburst. She was asking if these are side effects that have not been reported. She has called so many people trying to figure out if the Covid 19 vaccine caused this. Everything else for her son was normal, normal activities and normal diet, nothing was different except the Covid 19 vaccine. She did not know how many people she called. She did call Pfizer yesterday and spoke to someone who put her on hold. She doesn't think that agent took a report. She has no report or reference number. She further reported that on Monday, 26Jul2021 he was still disoriented and couldn't remember some things. She reported that on Tuesday, 27Jul2021 her son seemed to be ok. It seems his symptoms resolved. She stated that when school starts, the schools may be requiring the vaccine for the kids who can get the vaccine. There were no relevant tests reported. The events did not result in emergency room or physician office visit. The clinical outcome of the event multiple personality disorder was unknown, and all other events was recovered on 27Jul2021.  Follow-up attempts are completed. No further information is expected.