What is that picture from?
Picture in #4 is from the TV show How I Met Your Mother.
One of the characters (Cobie Smulders) was supposed to have been a Canadian TV star as a teenager in the 1980s — named “Robyn Sparkles”). Her TV show supposedly taught math to children through songs and funny skits.
The pictured skit features the song “Two Beavers are Better Than One” which is unintentionally extremely suggestive. If you like, you can go on Youtube and see the basic skit from the show which is cut short by adult Robyn because her friends are laughing at her ridiculous song. You can also find a clip with the full song which is sung in a bar by the two women who have now grown up.
It’s all quite amusing. If you like beavers.