Here's a nice one:

A census taker knocks on a man's door and asks if he has children.
"I have three children" the man says.
The census taker then asks: "How old are they?"
The man, being a keen mathematician replies: "The product of their ages is 72, and the sum of their ages is the same as my door number"
"Don't be ridiculous" says the census taker, "I can't figure out their ages from that"
"Oh right" replies the man "I forgot to mention that my eldest daughter likes chocolate"

The census taker then writes down the ages of the tree children.

How old are the three children, and why?

@MagnaOpera I'm impressed by your riddling skills! That one was good.
I'm not so creative so here's one I didn't make up, it probably won't last long.

You're locked in room. All that's in the room is a calendar, a piano, and a bed.
What do you eat and drink, and how do you escape?

@NutjobBob @MagnaOpera I'm impressed by your riddling skills! That one was good.
I'm not so creative so here's one I didn't make up, it probably won't last long.

You're locked in room. All that's in the room is a calendar, a piano, and a bed.
What do you eat and drink, and how do you escape?

I play piano for food, and send SOS with it?