I've just been watching Genesis of the Daleks again with my son. One of the better Dalek stories.
One thing I do find funny though is the death of Garman. The actor waves his hands in the air, and then the negative effect death ray kicks in.
The overall effect always reminds me a bit of Al Jolson ...
http://cache.eb.com/eb/image?id=10622&rendTypeId=4
Unfortunately death by special effect is pretty tricky stuff, esp when the effect isn't added until post-production, the temptation is all too often to overact.
Anyone else have any favourite comedy deaths in Doctor Who?