You were wanting to surprise your husband so you use your secret growth power to grow to a continental size (17.2 million miles tall), but in the process, you squash billions of people (none of them thankfully being your husband), but your growth wasn't even close to finishing, as you were growing, your husband returns and is shocked when he sees your growing size, you notice him and pick him up happy to see him

(Your kill count: 2,564,776,337)