How many Klingons does it take to change a light bulb?
1) Two. One to change the light bulb and one to kill the other and take all the credit. 2) None. There is no honour in changing a light bulb, besides, a true warrior isn't afraid of the dark.
How many philosophers does it take to change a light bulb?
1) "Hmmm ... well there's an interesting question isn't it?" 2) "Define 'light bulb' ..." 3) "How can you be sure it needs changing?" 4) Three. One to change it and two to stand around arguing over whether or not the light bulb exists.
How many bisexuals does it take to change a light bulb?
1) However many turns you on ;) 2) That depends ... is it AC or DC? 3) Three or more ... it's more fun to fumble in the dark that way instead of being alone.