The spy's domination laugh is the best, and the heavy has some more Sandvich related speak:
I am full of Sandvich and I am coming for you!
Ahh, so filling! Ya ha ha!
Moist and delicious ha ha ha!
Sandvich make me strooong!
Sandvich and I are coming for you!
Don't run, it's just ham!
Bologna is perfect fuel for killing tiny cowards!
(song) SaaAAndviich, Saanwich.
(another song)Mee and my, Saandwich.
What was that Sandvich? kill them all? Good idea! Ah ha ha ha ha haa!
Look at you tiny itty bitty men running from Sandvich!
(singing again) Sandvich and meee going to beat your ass
Bologna ah ha ha ha ha ha!
There's a few others but they're boring.