Ok, mad bikes. Have you seen a Hayabusa trike?!!
http://www.sportbikez.net/picture/808 and
http://www.trikeshop.co.uk/examples.htm
And have a look on
www.insidebikes.com and in the review section check out the Rolls Royce Y2K (helicopter jet engine, 286bhp) and the Wibereg Bigtoe (5.3 litre V12, 300 bhp and as big as a bungalow!). I'd post direct links but the site isn't set up to do so. Mad, mad, mad, mad, mad.