Drac's office hours had technically been yesterday, but Drac liked his office, okay? Also, Mavis was very unlikely to show up there and ( find out what he was doing... )

When the line connected, Drac uttered a line he hadn't for about 75 years: "Wayne, I need your help with Mavis."

( Because your ex-bandmate BFF is the FIRST person to call for parenting help. )