Two classically trained violinists have been running a YouTube channel full of goofy, geeky humor, music games, and silly reviews, plus genuinely educational content about technique, styles of different composers and performers, etc.
The following are samples of the many videos on their channel (I’ve watched just a small fraction):
Here they try to guess composer, symphony, and symphony movement based on a short excerpt:
A video about problems with vibrato:
Ranking some violin duets in order of difficulty:
Getting their egos crushed by a child prodigy:
Bright Across the Lifespan 