Any idiom/expression meaning "bad effects appear".

[krised]

I was wondering if there's an idiom or an idiom-kind expression meaning that some bad effects start to appear, manifest themselves...i forget what it is and it seems to be something like take its dues...pay its course...i dunno...a combination of verb + pron (its) + noun.

hope someone can help me cus I've been stuck for an hour trying to trace this expression back from my head...and i fail..

[abaka]

Bad things happen.

There are negative side effects.

Things go wrong.

The bugs come out of the woodwork.

[svartnik]

This is a good one:
Cambridge Dictionaries Online - Cambridge University Press