The authors examine the consequences of an intrusive debt-collection tactic that targets delinquent borrowers’ social circles. Their identification strategy relies on the fact that some of the delinquent loans are not worked on due to collection agents’ excessive workload. The authors show that this tactic backfires and increases the borrowers’ default rate by 5.9 to 14.3 percentage points. Male borrowers and borrowers with better credit respond more strongly. Moreover, the effect is concentrated in the period when this collection practice was emerging and likely unexpected. These findings are consistent with the negative reciprocity interpretation: angered borrowers retaliate by defaulting on their loans.