Heh, so yeah it's finally been officially revealed that the Mac port of Day of the Tentacle I did also contained a stealth Mac port of the original Maniac Mansion to the Mac.

In the PC version of DoTT you can just use Weird Ed's computer and it dumps you into Maniac, and I had thought (after all these years) I made it work the same way on the Mac. But it turns out my memory had some faulty bits and, while it did work, it only works after you try it five times.

This was a concession to our Mac QA department, which was small, and a bit overwhelmed with the unanticipated ports of DoTT and Sam & Max. They didn't really have the bandwidth to stress test the Maniac Mansion port, so I made it a bit more of an Easter egg than it was on the PC.

https://www.youtube.com/watch?v=N5AZY3tNFW4&t=1s