OK mine would have to be....when i was a bit younger. I am 15 now, but this was when i was about 8 yrs old. I remember the day perfectly.
It was a Sunday, and my mom was cooking the roast dinner. My aunt came over with my cousin Kyle (who was 1 yrs old at the time). ME and Kyle were sitting on the stairs, and the phone was just right next to me.
I dialed 999 (or 911 for u americans!

) and said 'FIRE!' then i slammed the fone down. I didnt know that it rang or anything, so i thought i was just pretending.
But then, about 10 minutes later, we heard all these noises. 2 fire engines pulled up outside our house, along with an ambulance and 2 police cars. All my family (apart from my dad who was decorating the living room) went into the kitchen to see which house it was going into. Then these fireman stormed into our house!
At that moment i ran screaming into where my dad was an i said "I'm so sorry daddy please dont let them take me into jail!" Then this BIG policeman strolled into the living room and looked at me.
After my mom had told them it must have been me messing around, ya know what i did then? I blamed my cousin! I said "It was Kyle! He bashed the numbers with his hands!"
Lol. How stupid was that? Mind u i was 8 yrs old.....and i got the idea becuase i saw the flame on the gas cooker when my mom was cooking the carrots in the saucepan!
So, how about u guys?