Answer to "Where's Howie Kapowie?"

Well, did you get it right? The cheese cubes, when unscrambled, spell "purpulis enormosis." It wasn't much of clue, but then I figured out that Howie had followed quietly behind Wally to get something to eat. Wally could have been going to eat anything, of course, but Howie must have heard Wally talking about a hidden stash of cheese. He just can't resist cheese! When I finally caught up with Howie and Wally, they were sitting on a bench and eating a huge block of cheese they'd picked up at the supermarket.

So, mystery solved. Howie left me just enough of a clue for me to understand he was eating cheese with Wally.