For me ...

I'd say the time the docs at DG stuck a needle the size of a garden hose ( I swear it was that big around!!) under my knee cap to draw out fluid to figure out why my right leg was swollen up like a balloon ... oh and they forgot to give me the novocain first..... Doc was surprised I didn't hit him.. so was I .. I told him to leave very quickly before I changed my mind LOL ..

That hurt more then either of my major motorcycle wreaks ( one of which left me with an AC separation of grade 3 )