Well, all right, given that we're doing horrifying and not merely stupid, here's the list. Sorry if they're redundant, but it's the honest truth.
1. Grace in Bed W/ Roger Moore. I believe Moore jokingly(?) stated that it was the worst stunt he ever had to do
2. Cross-dressing Blofeld. Exactly why did he do this again? Couldn't he have just WW-floored his way on out? I can only imagine that he takes that "tedious journey" all the time for fun.
3a(TIE). Grave's Robocop suit. The second he turned around in that ridiculous, plasticy nightmare(complete with overly dramatic music no less!), I couldn't help but chuckle. The huge grin he's got when he turns around doesn't help either. It's as if the director wanted it to be a..."hahaha, now noone will be able to stop me from taking over the world" sort of grin, but it ended up being a "Look what my mom made me for halloween, neato!!!" sorta thing.
3b(TIE). Jaws's initial encounter with his girlfriend. The second she showed up, I knew something special was going down. By the time the music started to creep in, it was sealed. Bond had gone seriously kooky.
Honorable Mention goes to Roger Moore's "OOOOOOOOOOOOOOOOOOAH" bellow. While not horrifying, it makes me crack up everytime I hear it. It sounds more like someone capsizing a canoe then Bond.