Now... let's see whose glowing phosphorous face Redbeard really is.
4 seconds sound clip from Scooby-Doo, Where Are You! - Go Away Ghost Ship (S1E14).
You can hear this line at 00:19:54.053 in the Blu-ray version of the episode.
Quote context
[...]
- Nice going, kids. Uncovering these phony ghosts and their ghost ship is a job well done!
- Now... let's see whose glowing phosphorous face Redbeard really is.
- Mr. Magnus? And I thought, like, the butler always did it.
- Mr. Magnus was just about to lose his steamship line... unless he came up with a lot of money.
- And what easier way than to hijack your own ship and sell the cargo?
- They had a pretty neat ghost setup... even down to the ghost sword operated by wires.
[...]