Like Goktimus, the funniest ones I found were in the Mega Transformer Showbag, which I got this year owing to the fact that the legit one was:

a) still in the Energon era (owing to progress, I anticipate next year's to be Beast Machines)
b) lacking in any actual Transformers

What I ended up with was a crappy bird-jet-Gundam thing that broke (which came with tiny knockoffs of the Megazord from the first Power Rangers season) and an orange knockoff of G1 Onslaught (along with a sword and gun which I chucked out). Since I didn't know anything about Onslaught, or that this toy was somewhat a real Transformer, I gave him the Bruticus head which came with it and called him Craptimus Prime.

Also, once I saw a giant G1 Blitzwing in Paddy's Markets. Fortunately, I have Animated Blitzwing now, so my appetite for giant Blitzwings is satiated.

Then there was also the 'Transmorpher' I found in a local cheap crap shop. It'd have fooled anyone with the movie-style packaging-only it had a knockoff of FAB Ratchet inside, and Bumblebee's mugshot (albeit green) on the packaging.