My favorite Art Bell was the guy who talked about being a soldier in some alien war (sorta like stargate except the gate was a tunnel that took months to walk through). And how the aliens ate any humans who died along the way. Then they get to the other side and have to fight in some alien version of D Day and then afterward walk back through the space tunnel. He was on for about an hour and Art was just "oh wow and then what happened". Just let him monopolize the whole program.
The women callers who always had some story about a ghost/vampire were annoying.