Director Gautham Menon makes small appearances in his films.  I put together a small image with his appearances in four of his movies —

• Kaakha Kaakha (2003) — Gautham plays a police officer named Vasudevan.  There he is on the right of the frame.
• Vettaiyaadu Vilaiyaadu (2006) — He doesn't actually have a role in the movie, but he appears in the background as a dancer during the song "Manjal Veiyil".  He's in between Jyothika and Kamal Haasan in the picture.
• Pachaikili Muthucharam (2007) — I didn't notice this the first time I watched the movie, but spotted it only later on.  During the song "Kaadhal Konjam", there's a brief shot with the family on a bus.  The guy on the right of the frame, with his face partly obscured is Gautham.
• Vaaranam Aayiram (2008) — This movie hasn't been released yet (May release it seems), and I have no idea what it's about.  But it seems that Gautham has a bigger role to play in this movie.  There are two pictures I've seen on the net — the one above, and another one with him playing a guitar.

I haven't seen his other movies (Minnale and Rehna Hai Tere Dil Mein), so I don't know whether he makes appearances in those films too.  I went through my DVD of Gharshana but that is an inferior remake of Kaakha Kaakha, and as far as I can tell, he is not in that movie.

Speaking of Gautham Menon, here are a few video clips I came across on YouTube recently (thanks to a friend posting links on his orkut page) —

• Vettaiyaadu Vilaiyaadu Visual Effects — this clip is really cool and shows off a number of visual effects shots that EFX did for the movie.  I never realised there was so much effects work done for this movie!  Take the above pic for example — Kamal Haasan was actually hitting a wooden log which was later replaced with an image of the actor!  There's also this Behind the Scenes clip but I didn't find this as interesting.
• Vettaiyaadu Vilaiyaadu Deleted Scenes 1 and Deleted Scenes 2 — seems to be very raw footage but interesting.  All this stuff is cannibalised from the DVD of the movie.
• Pachaikili Muthucharam Trailer 1 and Trailer 2 — these are old but I'm linking them anyway, as I like the trailers and love the songs.
• Vaaranam Aayiram Trailer — Yes!  Gautham Menon's upcoming movie (May 2008) starring Surya, Sameera Reddy and Divya Spandana.  Trailer doesn't indicate what kind of movie it is (though, IMDb lists it as a thriller!), but the movie looks good anyway.  The music is again by Harris Jayaraj and the song used in the trailer is called "Adiyae Kolluthey".  Someone has been nice enough to put up this video with just that song and a montage of pictures from Surya's movies.  The song is very nice!

I'm looking forward to watching Vaaranam Aayiram, though I don't know whether it'll be released in Hyderabad.  But do have a look at the trailers above, all are good stuff.