Quote from Marshall in Mystery Vs. History
Barney: You guys have to see this.
Lily: No. We're with Ted on this. We don't want to find out about Janet, just like we don't want to find out about the baby.
Marshall: Because we like mystery, whether it's the hairy majesty of Bigfoot, or the bloodsucking ferocity of the Chupacabra, or the gender of our little miracle.
Lily: Thanks for putting those together in the same sentence, sweetie.