avionics crashing big-time
**** happens with EFIS, bit of static on the intercom. FO starts laughing, the Captain says "its not funny" and has a shuffle to get comfy looking at the standby instruments. The AP kicks out and the screens go black. 5 mins later it all reboots, sort your overlays out and put the AP back in.
Never had it flying steam instruments
So suitable compromise is steam instruments only.