Someone might want to stick a message on a mirror to serve as a daily reminder, boost self-confidence, or provide motivation when looking at themselves.
answer is the answer
The person who received the message would get scared, or would act mature and remain calm.
Yes, they can. You would provide the message in your question though.
Someone can find a personalised Santa message for children at the Portable North Pole. You can make a video message for your children or someone else here.
Instant messaging
You would have to install AOL Instant Messenger.
I would suggest any 5A drum stick of a major brand.
You can't really get people to read your message board. Someone would have to have a reason to go to your message board. Just to find it, they would have to see your name and click on it, or hit "reply" on their own message board [provided you left them a message]. The message board is mostly for people to leave you a message. But you can use it to write yourself a reminder, or a note, or saying you'll be gone for a while, in case someone does visit, things like that.
Such a message is pointless. The person who sent it is confused.
People look in a mirror while putting on makeup so they can see what they are doing. Otherwise it would be very difficult to know if you are putting the makeup on properly.
I see that someone had been watching youtube lately :) But, to answer your question, a mirror is the colour of what it is reflecting. For example, if you were wearing a completely purple outfit and you were in a completely purple room, the mirror would be purple.
Only someone would know that if they were a stalker... SHEESH!