Alexander Graham Bell forgot his own daughter at the beach…
For me, if I’m supposed to take it with me, chances are I’ve forgotten it. I’ve gone to birthday parties and left the present behind. I’ve left my keys, wallet, lunch, phone, even my laptop (work was kinda sucky without it for the day!), DVDs I’d borrowed…
Except my cat. I haven’t forgotten my cat yet!
@Aerin: Thanks for the link! 
That will be awesome!