Why do they call Wednesday 'Hump Day'?

[capcartoonist]

I never get laid on Wednesday. crying  

[my dog ate my sanity]

Statistical improbablility, or scheduling conflicts?  

[xXYour Last ResortXx]

I think they call it hump day because it's right smak in the middle of the week, but my friend Chris goes around dry humping people!he's kinda a perv, but he's stilll my friend.....  

[sillydave]

yay hump day i go first twisted  

[sbluestars13]

Woot for perverts in the middle of the week?  

[my dog ate my sanity]

Scheduling conflict then.