It's bad to open other people's mail.
Greg lives with his partner, Kelly, who has received a letter which is in a strange looking envelope.
Greg wants to know what is in the envelope.
Greg waits for his partner to get home and for her to open it then asks her what was inside.
Greg gives into his curiosity and proceeds to open the envelope.
Greg's partner is excited to share with him the good news she got in the mail.
Greg's partner later finds out and considers this an invasion of privacy.