It's the "sons of witches" that makes it great

(fingers drumming)  "Oh, hey.  Uhh... sorry.  Not much this-date-in-history.  If it's your 21st birthday, you mighta been conceived after Darkman.  Sorry.  Best I came up with."

"Your folks must have been ... interesting, though.  Too bad they're not still together; you could ask 'em about it."

"... oh, they are still together?  Like, on purpose?  Oh, wow.  I'm sorry, kid.  Look, this round's on me."

"No, no---nothing about that.  Um, because it's your birthday?  Happy birthday!  Just ... just drink this."