One might not think a mug would be a high-end item.
But this one is! This mug is extremely rare. It was only sold out of Segaworld Sydney in Australia, and it is unique among mugs because it's actually shaped like Sonic's head, rather than having pictures instead. Several factors supposedly contribute to it's rarity including- it can easily chip or break, it was expensive in the store discouraging buyers, only Australia had it, they didn't make too many of them, it looks like it could be difficult to clean.
The mug itself is a pretty good likeness, (especially for a hollow head) with shortened spikes, and an appropriatly placed handle.

Would it be difficult to drink out of? Maybe, but it's so rare it's unlikely anyone knows. The mug could be a star in any collection...if you can find one.