What's your annoying/funny cellphone experience with the public?

well i had my cell phone on speaker and i was talking into it while i was in the car!! i saw kids in the car next 2 me laughing and pointing @ me!! i wondered why!!! i asked my friend (who i was on the phone with) why they could they be laughing @ me she said well your not signing to the radio, so ummmm i guess they dont see the phone and your talking to me!! i thought that was kinda funny!!! but....... i dont know!!!