Oh, Mr. Flower Cart Guy, do stop screaming. Professor just wants to buy a floral bouquet for a lovely lady he's calling on. I really don't see what the problem is here. It's like you've never seen a guy taking his pet for a stroll while shopping or something.
"Pardon me, good sir, but I wonder if you could recommend a particularly delicate bouquet for my reptilian companion, Reginald. Do not be alarmed, he is quite well behaved and is in fact, quite a gentle giant. ... Then again, I spoke tooo soon. Reginald, please spit him out. He is a florist, not a flower."