May 2025 presented a notable anomaly in Diss's crime profile: a 100% surge in bicycle theft, rising from zero to one incident. This unexpected spike stands in contrast to the area's otherwise stable crime trends and its position as one of the UK's safest built-up areas. Diss recorded 59 crimes in total, yielding a crime rate of 6.0 per 1,000 residents—25.9% below the UK average of 8.1. Violence and sexual offences dominated the crime mix, accounting for 45.8% of all incidents, followed closely by shoplifting (11.9%) and anti-social behaviour (11.9%). While the overall rate remained consistent with Diss's historical performance, the seasonal context of May—characterised by longer evenings, bank holidays, and increased outdoor socialising—may have contributed to the rise in violent crimes. The area's lower population density and rural-adjacent location likely play a role in its below-average rates for anti-social behaviour and public order offences, which are typically more concentrated in urban centres. However, the 100% increase in bicycle theft raises questions about local factors, such as the timing of university term breaks or changes in cycling infrastructure, that could explain this outlier. The data also shows that Diss's crime profile is shaped by its character as a small built-up area within South Norfolk, where community cohesion and limited nightlife may temper certain types of crime while leaving others, like property-related incidents, vulnerable to seasonal fluctuations.