Here are a couple of (somewhat) recent Jagged streams on the topic:

FAF Sandbox
FAF School

I remember a game, pretty sure from a high-level tournament, where ZLO spammed mech marines. And I don't mean he made a few more LABs than people normally make. He made only mech marines for several minutes and he won.

I don't remember enough details to pull a replay ID or VoD, but I'm pretty sure it was featured in a Petric video. Which leads me to an even better anecdote:

Once upon a time Petric made highlight videos. And they were awesome. I can't seem to find them anymore, though.