They poisoned my wife and two year old son and me in 1978. I haven't been back since.
The three of us ate at Wendy's, my 4 year old son wasn't hungry and ate nothing from there. The three of us who did spent the night in the hospital with IVs to rehydrate us from all the vomiting and diarrhea. Proof enough for me that Wendy's poisoned us.
My favorite Wendy's moment...
In a Wendy's just outside Little Rock, AR on the way to Dallas. The guy making my buddy's chicken sandwich looks for a knife for the mayo. He looks around for a moment, shrugs, then sticks his thumb in the mayo and spreads it on the sandwich. Then he sticks his thumb in his mouth and licks off the remaining mayo.
Once the sandwich has been eaten and we are back on the road, I mention the incident to my friend.