Landing that first "real" job. Becoming engaged. Expecting a child. Having children. Children achieving. Buying a home. Travels. Events. Enduring the weather. Accomplishments. Sacrifices. Good deeds. Life experiences.
Just a few things myself and others "fairly explode" when sharing.
How about God and the plan He laid out so we can be with Him? How often are we as Peter?
"Peter fairly exploded with His good news".