Versatile actor, and had lots of "evil" roles. I remember the plate glass mishap in The Omen, but I somehow had Warner confused with the guy who ended up being pierced by a lightning rod that was knocked off a church spire. The skewered one was a priest. The lopped one, Warner, was a photographer. The pretty one was dropped on a wrought iron fence by an evil nanny, or something like that. IIRC, the Omen franchise followed a basic rule: when the sequels decline far enough in quality, you hire Sam Neill for a starring role. No, that's not quite fair - Neill was in The Piano, and it had no sequel.
Not sure how Warner died twice on Titanic. Would be interest on how that research pans out.