Unexpectedly big wins improve two kinds of memory

Researchers have discovered that instances in which outcomes are better than expected — finding an unexpectedly good parking spot, for example, or spotting a $20 bill on the sidewalk — improves memories of specific events. This is in addition to the long-established role that unexpectedly good outcomes have in influencing what are called integrated memories.
Source: Science Daily, https://www.sciencedaily.com