* The title is incorrect: There might be a misspelling or variation in the title.
* The film was lost: Many silent films from that era were lost or destroyed.
* It was a local production: The film might have been a regional or less widely distributed production.
To find information about this film, you could try:
* Searching with variations of the title: Check online film databases like IMDb, Filmweb, or the Internet Archive using different spellings or variations of "Como por un tubo."
* Looking for information about Spanish cinema in 1919: Research historical sources on Spanish film production during that period.
* Contacting film archives: Reach out to Spanish film archives or historical societies for possible information about the film.
Without more details, it's difficult to definitively say whether the film exists or who appeared in it.