Sim calls Mom on the phone to chat.
While the call is gong on, same sim invites his sister-in-law to go the Humor and Hijinks festival, but she wants to sleep.
Then the same sim invites his younger sister over, all while still on the phone with their mom.
Sims can apparently see through walls because they'll stand staring through the stairway, apparently watching the TV on the other side instead of walking around the stairway to sit on the couch.
Just remembered another one. Young adult and teen Sims inviting children to the bar. Why? No, they are not going to the bar!