This was told to me many many moons ago:

Two vikings travelled many miles with their horse. They travelled over the plains to the base of a large mountain range. They went to the top of the first mountain. As they reached the top, the larger of the two men dismounted the horse, rose his hands above his head, and yelled, “I AM MIGHTY THOR !” He got back on the horse, and the men went down the mountain.

The Vikings travelled to the next mountain. They travelled up that mountain. As they reached the top, the larger of the two men again dismounted the horse, rose his hands above his head, and yelled, “I AM MIGHTY THOR !” He got back on the horse, and the men went down the mountain.

The Vikings continued to the next mountain. They travelled to the top of the mountain, the man again dismounted, rose his hands above his head, and yelled, “I AM MIGHTY THOR !”

The second man responded, “I’d be mighty thor too from thitting in a thaddle all day!”

(this may in fact be better as a verbal joke…)