I got lucky - the "broken, unknown state" oscilloscope I got off eBay that cost US $80,000 new only needed a $16 part replaced.
Feast your eyes on some pretty awesome screenshots. 
to the first person who knows and can explain the physics behind the first 2 pictures.
https://octodon.social/media/tvyw4eNnSSsWsxx8B0c https://octodon.social/media/t5o2yJJVgvK1-H54Kfg https://octodon.social/media/E3ACsEVbcC8snZzlMGw https://octodon.social/media/Z4c7yL-N6pcTKdz6Uqk
@wohali Nice find!
I'm gonna guess that filters are involved. The first looks like you're looking at a signal that's passing through a multi-stage filter. Not sure about the second one.
@not_on_pizza Thanks!
Nope, no filters. The same signal is going to each input of the scope. Look at both 1 and 2 - the change is highlighted on the 2nd screen - and it might become clearer.
@not_on_pizza you're on the right track...another hint: nothing changed in the _physical_ setup between the two screenshots.
@wohali Hmm... you're adding those two humps together to get a bigger spikier hump?