Just that, really. I know a number of people who've been double vaccinated who have subsequently got Covid, including one who was in IC in hospital. I know a lot more people who have had Covid who were not vaccinated. I know two people who have had Covid multiple times (twice in one case, three times in the other; both under 30 and pre-vaccination). So far I don't know anyone who had Covid, then got double vaccinated, and then went on to have a second symptomatic infection. Clearly these people exist. I just read a study on PubMed about various HCPs in this exact situation. But among those with less frequent exposure, I'm not sure how likely it is? Anecdotal evidence would be very welcome!