See if your students can replace the "that" that has been removed for ease of speech - or take it out...
"First of all, forget everything you learned in obedience school."
"Sweet? I thought you wanted someone with spunk."
(full disclosure - I don't remember the last word - you could replace "spunk" with just about any adjective you like!)
"Ah, not too bad. Nothing here that money can't cure."
"Gentlemen, it's time we gave some serious thought to the effects of global warming."
Kinda fun to contrast "It's time!" and "It's high time..."