Spot The Clue

So I'm still trawling through those old magazines that I found after my house was turned upside down by the electricians recently and in the pages of Fantasy Adviser I came across this little strip:

I love the sound effect of "spong" when Imago punches the bum!

Anyway, I'm not having you reckless kids turn this blog upside down to find out how Imago knew the bum was the culprit - instead I'll post it tomorrow.

In the meantime, if you think you know how he knew, leave a comment.