The classics:

• what I did on my holidays
• lend me your wallets

There are other options:

• the distillation: organize and communicate existing knowledge. Missing it and it creates research debt
• adversarial collaboration: report and discuss the outcome of the results of an experiment between two people that disagree.
• replication: confirm an hypothesis or a demo. it often comes with learnings. Benchmarks are often not satisfying for example and a second experiment is useful.
• failure: why and how to avoid the failure. We often see the person success without the twenty who tried before (survivor biais). As an example there is A decade of major cache incidents at Twitter