Something drops/falls into somebody’s lap
Definition 1 of 1
Pro Tip 1/3Unexpected Lucky Break
Use it when something good happens unexpectedly, like a sudden opportunity or windfall. 
I was going to cancel the trip, but a travel voucher fell into my lap.
Pro Tip 2/3No Effort Required
Emphasizes that something was gained without working for it or looking for it. 
A job offer fell into my lap right after graduation.
Pro Tip 3/3Serendipitous Events
Suggests happy surprises or fortunate events that occur by chance. 
The perfect apartment just dropped into my lap.