best "candid cam" type of show I (and apparently others) have seen:
http://www.youtube.com/watch?v=fdsI1cdZAWI&NR=1
"banana split" - that you weren't expecting (that's gotta hurt!):
http://www.youtube.com/watch?v=pzavyRuAj6Q
p.s. please, others, post something here too!