One bursts into tears. The other bursts out of tears
A knife has a point.
A triathlete doesn't go both ways.
He wanted to take a month off.
If you said "tear an ACL !" to a star athlete, you'd be shot on the spot.
Dave promptly burst into tears as not everyone in the world knew Dave.
One bursts into flames in the sunlight, and the other is a vampire.
Paula Ab-doula
Doesn't matter, still born.