I have at least 3 TV appearances to my name
The first one was during my work experience, when a group of people came into the lab to film a couple of bits for some documentary about forensic science or something. I was on the other side of the room filing samples in boxes when they asked if I could sit at one of the lab benches with some samples and "look busy in the background" whilst some presenter dressed herself up in a lab coat and goggles and prattled at the camera for 10 seconds about something or other.

The other two appearances were less exciting but were at least seen by friends and family: my magnificent hair has led to me being spotted in the audience at the filming of an edition of Have I Got News For You and, more recently, University Challenge.
(LongJohnBaldry, Mon 29 Mar 2010, 10:42, 2 replies, latest was 16 years ago)

I was on Irish TV once
'scratching' for an 'electro band' at the Guinness Jazz Festival. We had a 'crew' of 'b-boys' doing 'break-dancing' too.

It was 'excellent'.
( Monty Boyce, My cheese game is strong, Mon 29 Mar 2010, 10:44, Reply)

Did your magnificent hair not draw all the attention
away from the electronic keyboard ensemble and casually attired modern dancing troupe?
(LongJohnBaldry, Mon 29 Mar 2010, 10:48, Reply)

I fear that it may have.

( Monty Boyce, My cheese game is strong, Mon 29 Mar 2010, 10:49, Reply)

I had feared that my hair would draw all the attention from the panellists on HIGNFY
But Michael Winner was on the panel, so naturally everybody's attention was focussed quite squarely on the 'hilariously witty public figure' that is he.
(LongJohnBaldry, Mon 29 Mar 2010, 11:09, Reply)

I was on TV when John Major came to visit my school.

( Peej, Mon 29 Mar 2010, 10:49, Reply)