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I would just call it, but I would need to know a bit more about the player? When did he get his big stack, how has he been playing with his big stack, making moves like this a lot?

On one hand he has enough chips to risk losing a coinflip situation by going all in with a middle/high pocket pair/high connectors, but on the other hand, if he had something big like a high pocket pair, do you really think he would make such a quick move as to go all in, wouldn't you expect someone in his position to try and play them as slowly as possible to get as many chips out of you as he can, and *not* risk coinflips/allins? Again, this all depends on what you have seen so far from this player as to his style