Lena and Ole are sitting on the sofa watching TV when suddenly Lena reaches over and gives Ole a good hard thump on the back of his head.
"Now what the heck was that for?", he says.
"That's for being such a lousy lover all these years."
So Ole thumps her."Why'd'ja' do that?" says Lena.
"Thats for knowing the difference." syas Ole.

troll