riddle - what goes up a drainpipe down but...?

[David H]

wont go down a drainpipe up ??

 

[trina_purplephoenix]

Say whaaat??

 

[OriginalBubble]

an umberella

 

[?~RAnDomNe$$~?]

Spider, water, all those that has gravity lolz XOXOXxx

 

[Tyldesley B]

an umbrella