“Life is full of surprises, but never when you need one.”
“Life is full of surprises. Why is that always surprising?”
“Life is full of surprises, but the biggest one of all is learning what it takes to handle them.”
“Life is full of surprises, so you may as well get used to it.”
“Life is full of changes. And surprises. And the inexplicable(s).”
“Life's full of surprises, and they ain't all bad.”