I figured out how to break Blitzcrank's Poro roundup

When playing as Thresh and a poro snax item appears:

1. Separate the poros on the line the poro snack is on such that one poro is behind you and the other is running toward the snack
2. Grab the front poro and the poro snack
3. Get a lovely freeze. Unfortunately, there's not any digital sounds of satan accompanying it like the good ol' days, but it's fun.
4. Make a discussion about it.

Congratulations, you just crashed a browser game! I'm not sure if this is reproducible with Nautilus.

If I had to guess, it's caused by the multiple animations overlapping.