It’s a long time since I posted anything in the Non Technical.So here is something you can try when you are really really bored – Composing songs with your Landline telephone set. 
If your phone supports Tone dialing then you can create various sounds by pressing the keys. With some effort you can create recognisable tunes with them too.
Here are some examples :-
Happy Birthday
1 1 2 1 6 3
1 1 2 1 9 6
1 1 # 9 6 3 2
9 6 9 3 6 3
Mary Had a Little Lamb
3 2 1 2 3 3 3
2 2 2 3 9 9
3 2 1 2 3 3 3
3 2 2 3 2 1
Twinkle, Twinkle Little Star
1 1 9 9 # # 9
6 6 3 3 2 2 1
9 9 6 6 3 3 2
9 9 6 6 3 3 2
1 1 9 9 # # 9
6 6 3 3 2 2 1
More songs are available over here .
Btw, don’t expect them to be very melodious