I was nodding along on my ipod the other week and the dealer took that as a check for some reason. I think the word check or a prominent tap of the table should be used only.
Prob saved u some money!

As for the final table nerves I'm sure there would be if I ever made one!
It was a serious post! As a side note I can sit with an even pulse when playing for large stakes online but last week I noticed i'd got the shakes in my local £10 rebuy! Go figure!