The odd thing about the current arc is not just that John and Elly stupidly left a whole bunch of crap behind them for Mike and Lizzie to get into and cause all manner of 'comic' mischief. The problem is that for some reason or another, Mike was able to light the Cigar of Waking Moron Mom and Doofus Dad because he had ready access to matches. The stranger thing still is that this wasn't the first time that this has happened. As you will remember, the whole mess with Connie's trip to Montreal started off because Mike was screwing around with Phil's pipe that he left behind. As then as it is now, the idiot Pattersons forgot to tell Mike not to screw around with matches like they ought to. Personally, I tend to think that Grandpa Jim was the one to teach him not to screw around with that sort of thing. He seems to have more brains than his kids so it tracks that he's the one to fix their mess for them.