When you do this, make sure it's a LOT of small items from different areas so it's a bigger PITA to restock.
For bonus points, hit a Dirt Cheap, Dollar Tree or something else so you can add a few items they don't carry. We used to go buy some random cheap store brand item, then smuggle it into a different store to slip into the "to be re-shelved" pile up by the registers, then wander around until the confusion got going.
Too bad HEB occasionally hires stockers smart enough to just toss Great Value items found in the bin, while WalMart stockers will wander around for an hour trying to find a spot for a can of Hill Country Fare green beans.